"Except that, in the case of land, the aggregate supply is unalterable; while in the case of capital or labor we cannot be sure how price-changes will affect the aggregate supply."

Much significance attaches to these exceptions, as later will appear.

--6. _The Disturbances of Monetary Changes_. But let us still keep a critical eye on Law II, and submit it to another flashlight from our practical experience. The recent world war made us all acutely aware of a remarkable rise in the price of almost everything, which yet did not seem to diminish appreciably the demand. The explanation of this paradox is not difficult to find. There was an immense increase in the volume of nominal purchasing power, due to a complex set of causes, of which "currency inflation" may be taken as the symbol. Now perhaps we are ent.i.tled to a.s.sume the absence of such currency changes as part of the "other things being equal" which is always understood as implied. But it is rash to take this particular a.s.sumption for granted, more especially in these days. Already people are too apt to speak as though the trade depression (which as these pages are written holds us in its grip) cannot pa.s.s away until pre-war prices are restored, ignoring altogether the great and probably permanent increase in nominal purchasing power which the war has left behind it. It would be safer, therefore, to add explicitly to Law II the reservation, "a.s.suming that there is no change in the general volume of purchasing power."

Monetary and allied questions will form the subject of the second volume of this series. It must not be supposed that our general laws have no bearing on them. On the contrary, Law I, which all this time has remained serene and undisturbed by the occasional discomfitures of Law II, is the gateway through which all questions of currency, banking and the foreign exchanges should be approached. It is well to note, as an inexorable corollary of Law I, that prices can rise _only_ if demand exceeds supply, and fall _only_ if supply exceeds demand; and hence that it is only through the agency of changes in the demand for and supply of commodities and services that an inflation or deflation of the currency can influence the price level. Further, since a condition of things in which supply generally exceeds demand spells what we know and fear as a trade depression, it may be well to note at once that falling prices and unemployment are inseparable bedfellows. For we are far too apt to shut our eyes to these unpleasant truths. But we cannot pursue them further here; and in the remainder of this volume we shall not be concerned (except, perhaps, incidentally) with questions affecting the general level of prices or of purchasing power; but rather with the relation which the price of one commodity bears to that of another, with the rate of interest (which being a rate per cent is not essentially dependent on the price level), with "real" wages (as distinct from money wages) and the like.

--7. _The Trade Cycle_. But our reference to trade depressions suggests a final comment on Law II. One small qualification was embodied in our original statement of it, namely the words "sooner or later." A rise in price may not check the demand immediately (even if the printing presses are standing idle in the Treasuries); it may actually stimulate it for a time. For people may fear that the price will rise further still, and hasten to buy what they _must_ buy before very long. Sellers may share the same opinion, and be reluctant on their side to part. When prices are falling the roles are reversed, and we are likely to see the sellers tumbling over one another in a frantic eagerness to sell, the buyers wary and aloof. Sooner or later, indeed, these tendencies must dissolve and disappear; but they may persist for a longer period than might seem probable at first. For the raw material of one trade is, as we say, the finished product of another. The demand for one thing gives rise to a demand for other things, for the labor with which to make them, and so on in an expanding circle. A sympathy, subtle and intense, unites the business world, and a wave of depression or animation arising in any quarter may spread itself far and wide, heightened by the gusts of human hope and fear, and continue long before its influence is spent.

Here we are upon the threshold of one of the most striking and formidable of economic facts, the regular alternation of periods of good and bad trade, each very widespread, if not world-wide, in its range, each comprising certain regular phases of acceleration and decay, and each infallibly yielding sooner or later to the other. The details of these phenomena are highly complex, some of them obscure; an immense literature has already been devoted to the subject, yet its systematic study is hardly more than begun. The account given in the preceding paragraph is incomplete and meagre. It is inserted here in the hope that it will impress the reader with a sense both of the fact of these alternations and of the deeply rooted nature of the causes from which they spring. They take a heavy toll of human happiness and wealth; and there is no object that more urgently calls for concerted human effort than that of mitigating them, and of alleviating the misery which they bring in their train. Still better, of eradicating them if that is possible; but let none suppose that it can be lightly done. Meanwhile, let us always remember that they form the atmosphere and medium in which the enduring tendencies of the business world must work themselves out. It is often convenient to speak of "normal conditions" in this trade or that; but hardly ever can it be truly said of a particular moment that conditions are normal. The normal is rather a mean level about which oscillations to and fro, round and about, are constantly taking place, but which itself is reached only by accident, if at all. Whenever we say that some new factor should in the long run lower the price of this or that commodity or service, the picture which these words should convey to our mind is one of the price rising less on times of boom, and falling more in times of depression than is the case with other things. And if ever our faith in some honored economic law is shaken by the apparent ease with which, perhaps, in times of active trade, sellers are able to advance their prices to whatever figure (so it almost seems) they choose to name, let us rally our sense of economic rhythm, and reserve our judgment until the trade cycle has run its course.

CHAPTER III

UTILITY AND THE MARGIN OF CONSUMPTION

--1. _The Forces behind Supply and Demand_. The laws enunciated in the preceding chapter const.i.tute the framework and skeleton of all economic a.n.a.lysis; but they do not carry us very far. It is only through the agency of these laws that any influence can affect the price of anything: but what influences may so affect it is a question which we have still to consider.

Let us begin with ordinary commodities and ask ourselves, in the light of experience and common sense, upon what factors their price seems mainly to depend? Two factors spring to mind at once; their cost of production and their usefulness. As regards the former, the case seems clear enough. We may indeed sometimes grumble that the price of this or that commodity is unconscionably high in comparison with its cost; but this only goes to show that we conceive a relation between price and cost as the normal, governing rule. If one commodity cost only a half as much to produce as another, we should think that something had gone very wrong indeed, if the former commodity were sold for the higher price. But, when we turn to the usefulness of commodities, the case is not so clear. Usefulness has some connection with price, so much is certain; for an entirely useless thing, fit only for the dust-bin (and known to be such, it may be well to add) will fetch no price at all, however costly it may be to produce. But it is not easy to express the connection in quant.i.tative terms. It seems reasonable enough to say that the prices of commodities are roughly proportionate to their costs of production. But directly we contemplate saying a similar thing of their usefulness, we are pulled up short. As we look round the world, and enumerate the commodities which by common consent are the most useful, salt, water, bread, and so forth, the striking paradox presents itself that these are among the cheapest of all commodities; far cheaper than champagne, motor-cars or ball-dresses, which we could very well get on without. As things are, of course, a ball-dress, or a motor-car costs more to produce than a loaf of bread or a packet of salt; and the common-sense explanation of the paradox seems, therefore, to be that the cost of production is a more weighty influence than the usefulness, or utility, as we will henceforth call it (so as to include the satisfaction we derive from not strictly useful things). We are thus tempted to conclude that, provided a commodity possesses some utility, its price will be determined by the cost of production, the degree of utility being unimportant. This was exactly how the position was gummed up for many years in systematic treatises upon Political Economy; and it was not until fully half a century after the _Wealth of Nations_ that a discovery was made which threw a fresh light on the whole matter.

First of all, let it be clearly observed how very unsatisfactory is the above account. In Chapter II where we were treading surely, with a sense of solid ground beneath us, we drew no such invidious distinction between supply and demand. They seemed then to possess an equal status. But cost of production is the chief factor which, in the case of commodities, ultimately determines the conditions of supply. Utility, similarly, is the chief factor which ultimately determines the conditions of demand. Must not then the symmetrical relations between demand and supply be reflected in a corresponding symmetry between the utility and the costs which underlie them? Demand springs obviously from utility; the only motive for buying anything is that it will serve some real or fancied use. Can we then accord to demand so dignified and to utility so subordinate a place? There is here an inconsistency which we must somehow reconcile. It will not serve as a solution to distinguish between different periods of time, and to say, as economists used to say not very long ago, that price is governed over a short period by demand and supply, but in the long run by the cost of production. This still leaves our sense of symmetry unsatisfied. Moreover, the conception of cost of production, when we consider it as ruling over a long period, frequently seems to lose any precision, as an independent factor, which it may otherwise possess. Motor-cars, we have agreed, are more costly to produce than loaves of bread; but, as we know well, the cost of producing motor-cars varies enormously, accordingly as they are produced on a small or a large scale. By the methods of ma.s.s production they can be turned out at a relatively low cost per car. But this requires that they should be purchased in large numbers and this in turn throws us back to the demand for motor-cars, and plainly enough, to people's judgment as to their utility. In some cases, the opposite phenomenon occurs. In the case of British coal, for instance, the average cost of production would be much lower than it is if the output were reduced to a fraction of its present volume, and if only the richer seams of the more fertile mines were worked. Once again, therefore it is difficult to measure the cost of production until we know the magnitude of the demand, which in a manner, which we have still to elucidate, clearly depends upon the utility.

If we take the problem of joint products, the conception of cost of production fails us still more conspicuously. For what is the cost of producing wool, or the cost of producing mutton? We can speak of the cost of rearing sheep: but it is hardly possible to allot this cost, except quite arbitrarily, between the two products. How, then, can we explain the separate prices of these things by reference to cost alone? Instances of joint production are becoming so common in the modern world, or at least, with the growing attention to the utilization of by-products, are a.s.suming so much more heightened a significance, that an explanation of price, which does not apply to them, is a very feeble one indeed.

--2. _The Law of Diminishing Utility_. Let us turn back, then, to the factor of utility, and see if we cannot put on a more satisfactory basis the relation between utility and price. The clue to the puzzle is to be found in a brief reflection on the implications of the second general law propounded in Chapter II. A rise in price, it was there stated, will sooner or later diminish the demand. This was a.s.serted as a matter of fact, observed from and confirmed by experience. But what does it signify? To what causes is this familiar fact to be attributed? The first stage of the answer is very ample. The many individuals, whose purchases make up the demand for the commodity, will buy smaller quant.i.ties now that the price is higher. Possibly some of them may cease to buy it altogether; but as a rule it would be reasonable to suppose that most people continue to buy a certain amount though a smaller amount than hitherto. Let us turn our attention, then, to the individual purchaser, and ask ourselves why he (or let us say she) acts in the manner indicated. The obvious answer is that the more she already has of anything, the less urgently does she require a little more of it. If she buys 6 pounds of sugar every week when the price is 7 cents a pound, but only 5 pounds when the price is 8 cents, she shows by her action that she does not consider that the additional utility she will derive from buying 6 pounds a week rather then 5 pounds is worth as much as 8 cents. But she shows at the same time that she thinks it worth 7 cents. For, when the price is 7 cents, no one compels her to buy that sixth pound. She could stop, if she chose, at five; and it may serve to make the point quite plain if we suppose her actually to hesitate before she buys the sixth. She has. .h.i.therto, let us say, been buying 5 pounds a week at 8 cents. To-day she enters the shop and finds the price is down to 7 cents. She asks for her customary 5 pounds; then she pauses, and a minute later turns her order into six. What are the alternatives which she has been weighing one against the other in that momentary pause?

Not the utility of the whole 6 pounds of sugar against the total price of 42 cents. For she has already ordered the first 5 pounds; and the decision to buy the sixth is taken independently and subsequently. She has been sizing up the _increment_ of utility which a sixth pound would yield, and she decides that this is worth the expenditure of a further 7 cents. Again, when the price was 8 cents she need not have bought as many as 5 pounds. She could have stopped at 4 had she chosen, and the fact that she did buy 5 pounds shows that the increment of utility derived from buying a fifth pound, when she might be said already to have 4, was worth at least 8 cents in her judgment.

This trite ill.u.s.tration enables us to lay down two important laws relating to utility. To state them shortly, it is convenient to employ one or two technical terms, which, unlike every term employed hitherto, are not very commonly used in their present sense in everyday life. Their adoption is desirable not merely for the sake of convenience, but because they help to stamp clearly on the mind a most illuminating conception, that of the "margin," which supplies the clue to many complicated problems. The last pound of sugar which the housewife purchased, the fifth pound when the price was 8 cents, or the sixth pound when the price was 7 cents, we call the "marginal"

pound of sugar. And the increment of utility which she derives from buying this marginal pound we call the "marginal utility" of sugar to her. We are thus able to state the fact that the more a person has of anything the less urgently does he require a little more of it, in the following formal terms:--

LAW V. The marginal utility of a commodity to anyone diminishes with every increase in the amount he has.

The total utility will, of course, increase with an increase in the amount, but at a diminishing rate. This law is usually called The Law of Diminishing Utility.

--3. _Relation between Price and Marginal Utility_ But this is not all. We are now in a position to perceive the true relation between utility and price. The relation is one which exists not between price and total utility, but between price and marginal utility. If we know only that a housewife will buy weekly 5 pounds of sugar at 8 cents per pound, but 6 pounds at 7 cents, we know nothing of the total utility of sugar to her. We do not know how much she might be prepared to pay rather than go without 3 pounds, 2 pounds, or any sugar at all. But we do know that, when she buys 6 pounds, the marginal utility of sugar is in her judgment worth something which does not differ greatly from the price. We can, therefore, say in general terms that the price of a commodity measures approximately its marginal utility to the purchaser.

This statement is perfectly consistent with the paradox noted above that the most useful commodities such as bread, salt and water are very cheap. For when we say that these commodities are supremely useful, we mean only that their total utility is very great; that, rather than do without them altogether, we would offer for them a large proportion of our means. But we would not value very highly a small addition to the bread, water or salt that we habitually consume; nor would most of us feel it as a very serious deprivation if our consumption of these things were curtailed by a small percentage. In other words, their _marginal_ utilities are small, and it is only the _marginal_ utility that has any relation to price.

--4. _The Marginal Purchaser_. A possible objection to the preceding argument deserves to be considered. Some readers may find the picture I have drawn of the hesitating housewife entirely unconvincing. They may declare that her mind does not work at all in the manner I have indicated. She will have formed certain habits in regard to her weekly purchases of sugar, which are connected very vaguely, if at all, with any conscious processes of thought. She will buy so many pounds of sugar weekly without troubling her head over the specific utility of the last pound she buys. When the price falls she may, indeed, buy more; but it will not be because she separates out and considers by itself the extra utility of an additional pound. She may buy more, because she has formed the habit of spending so much money on sugar; and now that the price has fallen, the same amount of money will enable her to buy more pounds. Or, perhaps, she may be moved by instinctive and irresistible attraction to buy more of a thing when it is cheaper, similar to that which inspires so many people to face with ardor the horrors of a bargain sale. In any case the fine calculations I have imagined convey a fantastic picture of her state of mind. And how much more fantastic, the critic may continue, of the state of mind in which things of a different kind are bought by less careful people. When, for instance, one of us happy-go-lucky males (more liberally supplied, perhaps, than the housewife with the necessary cash), decides to buy a motor bicycle, or to replenish his stock of collars or ties, does the above a.n.a.lysis bear any resemblance to the actual facts? In the case of the motor bicycle, the purchaser may, indeed, weigh the price fairly carefully against the pleasure and benefit, though contrariwise he may be a rich enough gentleman hardly to bother about this. But, one motor bicycle is as much as he is at all likely to buy, and what becomes, then, of the distinction between total and marginal utility? In the case of the ties and collars, the vagueness of many of us about the price will be extreme. We probably have been uneasily conscious for some time of an inconvenient shortage of these troublesome articles and eventually will go off (or perhaps will be sent off with ignominy) to the nearest suitable shop to make good the deficiency. How can we speak here with a straight face of the relation between marginal utility and price?

These are very pertinent criticisms; but they do not make nearly as much nonsense of the notion of marginal utility as may seem at first. The last point, indeed, serves rather to give it a fresh aspect of much significance. Those of us who do not bother about the price we pay for our ties and collars owe a debt of grat.i.tude, of which we are insufficiently conscious, to the more careful people who do; as well as to the custom which prevails in shops in Western countries (as distinct from the bazaars of the East) of charging as a rule a uniform price to all customers. If _we_ were the only people who bought these things, an enterprising salesman would be able to charge us very much what he chose. He could put up his price, and we would hardly be aware of it. And, as by lowering his price he could not tempt us to buy any more, price reductions would be few and far between. But fortunately there are always some people who do know what the price is, even when they are buying collars and ties; and who will adjust the amount they buy in accordance with the price. It is these worthy people who make the laws of demand work out as we well know they do. It is they who will curtail their consumption if the price has fallen and it is they who const.i.tute the seller's problem, and help to keep down prices for the rest of us. The rest of us--it is well to be quite blunt about it--simply do not count in this connection. We have no cause then to plume ourselves that we have disproved the truth of economic laws when we declare that we seldom weigh the utility of anything against its price. All that this shows is that our actions are too insignificant to be described by economic laws since they exert no appreciable influence on the price of anything. And this in turn shows the extreme importance of grasping clearly the conception of the margin. Just as it is the marginal purchase, so it is the marginal purchaser who matters. It is the man who, before he buys a motor bicycle, weighs the matter up very carefully indeed and only just decides to buy it, whose demand affects the price of motor bicycles. It is the utility which _he_ derives that const.i.tutes the marginal utility, which is roughly measured by the price.

As to the housewife, I am not prepared to concede that my picture is in essentials very fanciful. She may be a creature of habits and instincts like the rest of us, but most habits and instincts affecting household expenditure are based ultimately on _some_ calculation, if not one's own, and reason has a way of paying, as it were, periodic visits of inspection, and pulling our habits and instincts into line, if they have gone far astray. I am not satisfied that the housewife does not envisage the utility of a sixth pound of sugar as something distinct from the utility of the other five; she may buy it, for example, with the definite object of giving the children some sugar on their bread, and she may have a very clear idea as to the price which sugar must not exceed before she will do any such thing. Possibly I may exaggerate. I have the profound respect of the incorrigibly wasteful male for the care and skill she displays in laying out her money to the best advantage.

--5. _The Business Man as Purchaser_. But if the reader still finds the picture unconvincing, let us shift the scene from domestic economy to commerce, and subst.i.tute for the careful housewife an enterprising business man. Now, as anyone who has a business man for his father will have often heard him say, the vagueness and caprice which characterize our personal expenditure would be quite intolerable in business affairs. There you must weigh and measure with the utmost possible precision. You must be for ever watching the several channels of your expenditure, careful to see that in none does the stream rise higher than the level at which further expenditure ceases to be profitable. You will not even engage typists or install a telephone in your office without weighing up fairly carefully the number of typists or the number of switches that it is worth your while to have. And in deciding whether to employ say, five typists, or six, you will not vaguely lump the services of the whole six typists together, and consider whether as a whole they are worth to you the wages you must give them. You will, in the most direct and literal manner, weigh up the _additional_ benefit you would derive from a sixth typist, and if that does not seem to you equivalent to her wage, you will not engage her, however essential it may be to you to have one or two typists in your office. If on the other hand, the utility of having a sixth typist seems to you worth much more than her pay, the chances are that you will be well advised to consider the employment of a seventh. And so, where you stop employing further typists, the utility to you of the last one, of the "marginal typist" as it were, is unlikely to differ greatly from her pay.

Now this is not a fancy picture of some remote abstraction called an "economic man." Allowing for the over-emphasis which is necessary to drive home the central point, it is a bald account of the aims and methods of the actual man of business. To ascertain the margin of profitable expenditure in each direction, to go thus and no further, is the very essence of the business spirit, as the business man himself conceives it. When he condemns the extravagance of Government departments, it is their lack of just this marginal sense that he chiefly has in mind. "The lore of nicely calculated less or more" may be rejected by High Heaven and Whitehall, but no one can afford to despise it in the business world.

The transition from household to business expenditure involves an extended use of the word utility, which is worth noting. Commodities like bread, sugar, or privately owned motor-cars are sometimes called "consumers' goods" in contrast to "producers' goods," which comprise things such as raw materials, machinery, the services of typists and so forth, which are bought by business men for business purposes. The line of division between the two cla.s.ses is not a sharp one, and we need not trouble with fine-spun questions as to whether a particular commodity should in certain circ.u.mstances be included under the one head or the other. But, broadly speaking, things of the former type yield a direct utility; they contribute directly to the satisfaction of our pleasures or our wants. Things of the latter type yield rather an indirect utility. Their utility to the business man who buys them lies in the a.s.sistance they give him in making something else from which he will derive a profit. The utility of these things is therefore said to be _derived_ from that of the consumers' goods or services to which they ultimately contribute. This conception of derived utility leads to certain complications which we shall have to notice later.

--6. _The Diminishing Utility of Money_. But one important point must be emphasized in this chapter. The utility which a business man derives from the things which he buys for business purposes is the extra receipts which he obtains thereby. Derived utility, in other words, is expressed in terms of money, and the idea of its relation to price presents no difficulty. But the utility of things which are bought for personal consumption means the _satisfaction_ which they yield, and this is clearly not a thing which is commensurable with money. When, therefore, it is said that the prices measure their respective marginal utilities, what exactly is meant? What was it that the argument of --3 went to show? That the utility of the marginal pound of sugar would seem to the housewife just worth the price that she must pay for it; in other words, that it would be roughly equal to the utility she could obtain by spending the money in other ways. The respective marginal utilities which _she_ obtains from the different things she buys will thus be proportionate to their prices. But if she were to receive a legacy which gave her a much larger income to spend, she might buy larger quant.i.ties of practically every commodity; and, though she would obtain a greater total utility thereby, the marginal utility she would obtain in each direction would be smaller, in accordance with the law of diminishing utility. The prices might not have changed; the respective marginal utilities to her of the different things would again be proportionate to their prices, but they would const.i.tute a smaller satisfaction than before.

Thus we can only say that the prices of commodities will be proportionate to their real marginal utilities, when we are considering the different purchases of one and the same individual. The amounts of money which different people are prepared to pay for different consumers' goods are no reliable indication of the real utilities, the amounts of human satisfaction which they yield. Here we must take account not only of varying needs and capacities for enjoyment, but of the very unequal manner in which purchasing power is distributed among the people. The cigars which a rich man may buy will yield him an immeasurably smaller satisfaction than that which a poor family could obtain by spending the same amount of money on boots, or clothes or milk. When, therefore, we compare commodities which are bought by essentially different consuming publics, their respective prices may bear no close relation to their _real_ utility, whether marginal or otherwise. Thus the law of diminishing utility applies to money or purchasing power, as well as to particular commodities. The more money a man has the less is the marginal utility which it yields him; and, where the marginal utility of money to a man is small, so also will be the real marginal utility he derives in each direction of his expenditure. The extreme inequality of the distribution of wealth gives immense importance to this consideration. Its practical implications will be discussed in Chapter V. Meanwhile, we may express the conclusions of the present chapter by the statement that the price of a commodity tends to equal its marginal utility, _as measured in terms of money_, i.e. relatively to the marginal utility of money to its purchaser.

CHAPTER IV

COST AND THE MARGIN OF PRODUCTION

--1. _An Ill.u.s.tration from Coal_. We have already had occasion to note the symmetry which characterizes the relations of demand and supply to price. This symmetry was apparent throughout the argument of Chapter II, and it was a striking feature of the diagrams which we employed to ill.u.s.trate the argument. We shall do well to cultivate a lively sense of this symmetry, for it will frequently save us from ignoring factors which have a vital bearing on the problems we are considering. We should never leave an important feature of demand without turning to see whether it has a counterpart on the supply side, though indeed we may not always find one. In the last chapter we examined the relation between utility and price, and found that the true relation was between the price and what we termed the marginal utility.

Corresponding to utility on the demand side is cost of production on the supply side. The question should thus at once suggest itself--"Can we speak appropriately of the marginal cost of production, and will this serve to make clear the relation between cost and price?" To answer these questions, let us take one of the instances in which we found that price could not be explained satisfactorily by the bare phrase "cost of production."

An important feature of the coal industry, which recent events have brought into sharp prominence, is the great diversity of conditions between different coalfields and different collieries. We speak of rich seams and poor seams, of fertile and unfertile mines, and we are aware that the costs of raising coal to the surface differ very widely in accordance with these diverse natural conditions. Nor must we confine our attention to the cost price at the pit-head. If we wish to speak of cost of production as a factor determining price, we must use the term in a broad sense to include the transport and other charges necessary to bring the coal to market.

In this respect also one coalfield differs greatly from another. Some are well situated close to a large market, or within easy reach of the seaboard; others must incur very heavy transport charges to bring their coal to any considerable centre of consumption. These varying conditions lead, as we well know, to great variations in the financial prosperity of different colliery concerns. In Great Britain, under the abnormal conditions which prevailed during the war, and subsequently, these variations were so huge as to const.i.tute a most formidable embarra.s.sment and to contribute, more perhaps than any other single factor, to the unrest and instability by which the industry has been afflicted. But they are always with us, if usually upon a more modest scale.

What, then, is the normal relation between price and cost in the case of coal? Should we direct our attention to the average costs over the whole industry, or the costs incurred by the richer and better situated mines, or, lastly, that of the poorer and worse situated?

Now, as things are, it is clear enough that no concern will continue indefinitely producing at a loss. It may do so for a time, rather than close down altogether, hoping to recoup itself later when the market has taken a more favorable turn. But, in the long run, taking good years with bad, it must expect to obtain receipts sufficient not only to cover its necessary expenditure, but to provide also a reasonable profit on the capital employed. Of course, once the capital has been sunk and embodied in plant and buildings, which are of little use for any other purpose, a business may continue for many years, with a rate of profit far below what it had antic.i.p.ated. But plant and buildings gradually wear out, and need to be replaced; the course of technical improvement calls continually for fresh capital outlay, which a business in a bad way is reluctant to undertake. The tendency, therefore, when profits rule low over a considerable period, is for the plant to fall gradually into disrepair and obsolescence, and finally for the business to disappear. We can thus include an ordinary rate of profit under the head of cost of production, and say with substantial accuracy that for no business can this cost for long exceed the price if the business is to continue to exist. If then the relatively poor and badly situated mines are to be worked, the price of coal, taking good years together with bad, must cover the costs at which these mines can produce. If the price rules lower than this, sooner or later they will close down, and we will be left with a smaller number of mines, among which great variations of conditions will still prevail. Once more, the price must cover the cost incurred by the least profitable of these remaining mines, unless their number is still further to be diminished. Thus we can conceive of a "margin of production" which will shift backwards to more profitable or forwards to include less profitable mines, according as the demand for coal contracts or expands. But, wherever this margin may be, there is no escaping the conclusion that it is the cost of production of the "marginal mines," of those that is to say which it is only just worth while to work, to which the price of coal will approximate.

It follows that there is no real connection between price and cost of production throughout the industry as a whole. It follows incidentally that those concerns which can market their coal at an appreciably lower cost than the marginal concerns, are likely to reap more than an ordinary rate of profit, though royalties may absorb part of the excess.

--2. _The Various Aspects of Marginal Cost_. This relation cuts much deeper than the particular system under which the mines are at present owned and worked. If, for instance, we supposed that the various mines were amalgamated together in a few giant concerns, each of which comprised some of the richer and some of the poorer mines, the preceding argument would need to be recast in form, but its substance would be unaffected. For though a great coal trust could in a sense _afford_ to sell at a price lower than the marginal cost, setting its losses on the poorer against its gains on the better pits, is it likely it would do so? Why should it dissipate its profits in this way? It is clearly more reasonable to suppose that it would close down the poorer pits (unless it could advance the price of coal), and thereby maintain its profits at a higher figure. If, indeed, the mines were nationalized the deliberate policy might be pursued of selling coal at a price which left the industry no more than self-supporting as a whole. Some coal might thus be sold at less than its cost price, and the selling price would conform roughly to the _average_ cost. But such a policy, though in special circ.u.mstances it might be justified, would represent a very dangerous principle, which could not be applied widely without the most serious results. Nothing could be more fatal to any enterprise, whether it be in the hands of an individual, a joint-stock company, a State department, or a Guild, than that the management should content themselves with results which in the lump seem satisfactory, and regard losses here or there with an indifferent eye. That way lies stagnation, waste, progressive inefficiency and ultimate disaster. To inquire searchingly into every nook and cranny of the business, to construct, as it were, for each part a separate balance-sheet of profit and loss, to expand in those directions where further development promises good results, and to curtail activity where loss is already evident, is the very essence of good management. Here, it will be observed, we are using language very similar to that in which we described the principles which govern a business man's expenditure. The resemblance is inevitable and significant, for we are dealing here with what is essentially another aspect of the same thing. The object is to secure that nowhere does expenditure fail to yield a commensurate return. This we express, when we consider a business in its aspect as a consumer, by saying that its consumption of anything will not be carried beyond the point at which the marginal utility exceeds the price it will have to pay. When we consider it as a producer, we say that its production of anything will not be carried beyond the point at which the marginal cost exceeds the price it will obtain.

--3. _The Dangers of Ignoring the Margin_. This at least is the general rule. A business may decide deliberately to sell part of its output below cost, because, for instance, this will serve as an advertis.e.m.e.nt, bring it connections, and enable it to obtain a larger profit at a later date, or immediately on other portions of its sales. In so acting, it recognizes that the price obtained for a thing may be an inadequate measure of the real return it yields. In the same way, though for different reasons, a nationalized coal industry might conceivably be justified in selling some coal below cost price, because, let us say, it held that the price which the immediate purchasers were willing to pay was an inadequate measure of the utility of coal to the community as a whole. But in all such cases it is essential to be very clear as to what exactly you are doing; so that you may be at least moderately clear as to whether the policy is well advised. It may be sound enough to lose on the swings and make good this loss on the roundabouts, but only if your loss on the swings _helps_ you to a larger profit on the roundabouts. If you would get the same return on the roundabouts in any case, it would be better to cut the swings out altogether. So, if you are directing the policy of a nationalized coal industry, and decide to make a loss on a portion of your sales, you will need to know that the indirect benefit which the community will derive from this particular part of your coal output is worth the loss which you incur. You will certainly come to grief, if you pursue a vague ideal of lumping all results together, and regarding a profit somewhere as a sufficient excuse or a positive reason for making a loss elsewhere.

It is quite true that in big undertakings, where there are large standing charges, and where the organization possesses some of the characteristics of an integral whole, it is not easy to measure accurately the specific costs which should be a.s.signed to any particular portion of the output. But this difficulty is one of the most serious weaknesses of large undertakings; precise detailed measurement is the great prophylactic of business efficiency, and, where it is lacking the bacilli of waste will enter in and multiply. So clearly is this recognized, that the development of large scale business has led to the evolution of new methods of accountancy, designed to make detailed mensuration possible. We have most of us heard of them vaguely under such names as "comparative costings," but too few of us appreciate their full significance. It is hardly too much to say that the issue as to whether the size of the typical business unit will continue to become larger and larger, or whether it has already overshot the point of maximum efficiency will turn largely upon the capacity of accountancy to supply large and complex undertakings with more accurate instruments of detailed financial measurement.

--4. _A Misinterpretation_. The price, then, of a commodity tends roughly to equal its marginal cost of production; and this marginal cost (in perfect symmetry with what we observed as regards marginal utility), may be conceived as applying either to the marginal producer or to the marginal output of any producer. In the former aspect it is open to a misinterpretation, against which it will be well to guard.

Some advocates of socialism have argued, as one of the counts in their indictment of the present industrial system, that the price of a commodity is determined by the cost at which the least efficient concern in the industry can produce. They say, in effect, "Under the present compet.i.tive regime, you have to pay for everything you buy a price which far exceeds the necessary cost to a concern which is managed with ordinary ability. For, as economic theory has shown, it is the cost of the _marginal_ concern, i.e. the concern managed by the most incompetent, and half-witted fellow in the trade; it is the cost incurred by him, together with a profit on his capital, that the price has got to cover. The producer of no more than average capacity is therefore making out of you a surplus profit, which would be quite unnecessary in any well-arranged society." Such an argument is a gross caricature of the marginal conception. The half-witted incompetent will, as we know well enough, speedily disappear under the stress of compet.i.tion, and his place will be taken by more efficient men. There is an essential difference between him and the "marginal coal mine" of which we spoke above. For the probabilities are that of the coal resources, whose existence is clearly known, the more fertile and better situated parts will already be in process of exploitation; and there is not likely, therefore, to be a supply of substantially better seams which can be subst.i.tuted for the worst of those in actual use.

There _is_ likely, on the other hand, to be available a supply of decent business capacity which can be subst.i.tuted for the most inefficient of existing business men. The marginal concern, in other words, must be conceived as that working under the least advantageous conditions in respect of the a.s.sistance it derives from the strictly limited resources of nature, but under average conditions as regards managerial capacity and human qualities in general. Thus in agriculture we can speak of a marginal farm, which we should conceive as the least fertile and worst situated farm which it is just worth while to cultivate (of which more will be said when we come to the phenomenon of rent), but we must a.s.sume it to be cultivated by a farmer of average ability.

--5. _Some Consequences of a Higher Price Level_. The foregoing controversy will be of service to us, if it makes clear the manner and the spirit in which the marginal conception should be handled. It should be regarded not as a rigid formula which we can apply to diverse problems without considering the special features they present, but rather as a signpost which will enable us to find our way, a compa.s.s by which we may steer between the shoals of triviality and sophistry to the crux of any problem with which we have to deal.

Let us ill.u.s.trate its practical uses by an example which is of great interest and far-reaching practical importance at the present day. As has been already observed, the war has left behind it in all countries a great and almost certainly permanent increase in nominal purchasing power. Since the armistice prices have moved upwards and downwards with unprecedented violence; and it would be very rash to prophesy the precise level at which they will ultimately settle (using that word with considerable relativity). But, for reasons for which the reader is referred to Volume II in this series, it is safe enough to say that the general level of post-war will greatly exceed that of pre-war prices. Now this will apply not only to consumers' goods like milk and clothes, or to raw materials like pig-iron and cotton, but in very much the same degree to things like factories and machinery. Things of this last type are sometimes called "capital goods," because it is in them that a large part of the capital of a business is embodied. Now the fact that it will cost much more than it did before the war to construct fresh capital goods, has a significance which very few people appreciate. An existing factory cost, let us say, $500,000 to build and equip with machinery before the war. To construct a similar factory to-day would cost, let us a.s.sume (it is probably a moderate a.s.sumption) $1,000,000. Suppose 10 per cent to be the gross profit that is necessary to attract capital to the particular industry. Then it will not pay to construct this new factory unless the trade prospects point to the probability of a profit of about $100,000 per annum. But if the old factory is equally well managed, it too should be able to earn this $100,000, which upon the capital actually sunk would represent a rate of 20 per cent. The particular figures given are, of course, purely ill.u.s.trative; the conclusion to which they point is that, if new enterprises are to be undertaken, pre-war enterprises are likely to yield a rate of profit, on their fixed capital at least, increased in rough proportion to the price-level. Of course, in years when trade is bad, the factory which dates from pre-war times will not earn a profit of this kind, it may very likely make an actual loss. At those times it is very certain that few new factories will be erected. But it is difficult to reconcile a condition of trade activity, in which the constructional industries are busily employed, with a rate of profit to pre-war businesses on the fixed part of their capital of a lesser order of magnitude than has been indicated. It makes no difference, it should be observed, whether we suppose the new enterprises to take the form of starting of new concerns or extending old ones; in neither case will they be undertaken, unless there is reason to expect an adequate return on the capital which they require at post-war constructional prices. High profits (taking always good years together with bad) on capital sunk before the war in buildings and machinery are thus a likely consequence of an increase in the price-level.