At a given signal from the manager the (say) 60 bank messengers, each standing in front of the desk of his own bank and each having in hand before him 59 small parcels of papers, the parcels arranged in the same definite order as the desks around the room, step forward to the next desk and deliver each his parcel to the clerk sitting behind it, and so on till the circuit of the room is made. It takes but ten minutes. Each parcel is made up of cheques or credit-claims, the property of the bank that brings it and the debts of the bank to which it is delivered. Accordingly each bank of the circle receives through its sitting clerk its own debits to all the rest of the banks, and delivers to all through its standing messenger its own credits as off-set. In other words, each bank buys of the rest what it owes to each with what each owes to it. It is at bottom a mutual buying and selling of debts. There is of course a daily balance on one side or the other between every two of these banks, which must be settled in money, because it would never happen in practice that each should owe the other precisely the same sum on any one day; but substantially and almost exclusively the exchange at the Clearing-House is a simple trade in credit-claims. Each bank pays its debts by credits. A merchant is a dealer in commodities, a laborer is a dealer in services, and a banker is a dealer in credits. Each of the three is a buyer and seller alike, and the difference is only in the kind of valuables specially dealt in by each. In all cases alike, however, there is no buying without selling and no selling without buying; because, when one buys he must always pay for what he buys and that is selling, and when one sells he must always take his pay for what he sells and that is buying. This is just as true when one credit is bought or sold against a commodity or a service, and when two or more credits are bought and sold as against each other, as it is when two commodities or two services are exchanged one for the other.

But the Clearing-House is not by any means the only place where credits or debts (they are the same thing) are bought and sold. Every bank is such a place. Every broker's office is such a place. Every place is an establishment of the same kind where commercial rights, that is, claims to be realized in future time and for which a consideration is paid, are offered for sale and sold. The amount of transactions in Credits in every commercial country undoubtedly surpasses the amount in Commodities or that in Services.

Now our supposed observer and classifier, having noted on London Bridge the sale of material commodities, and in the Lowell Mill the sale of personal services, and within the New York Clearing-House the sale of credit-claims, has seen in substance everything that ever was or ever will be exhibited in the world of trade. He may rest. There is no other class of salable things than these three. Keen eyes and minds skilled in induction have been busy for two millenniums and a half more or less to find another class of things bought and sold among men, and have not yet found it or any trace of it. This work has been perfectly and scientifically done. The generalization is completed for all time.

The genus, then, with which Political Economy deals from beginning to end, has been discovered, can be described, and is easily and completely separable for its own purposes of science from all other kinds and classes and genera of things, namely, Salable things or (what means precisely the same) Valuable things or (what is exactly equivalent) Exchangeable things. In other words, the sole and single class of things, with which the Science of Political Economy has to do, is Valuables, whose origin and nature and extent and importance it is the purpose of the present chapter to unfold. We have fully seen already that this Genus, Valuables, is sub-divided into three species, and three only, namely, Commodities, Services, Credits. A little table here may help at once the eye and the mind:—

ECONOMICS.

The Genus Valuables
The Species{
{
{		Commodities
Services
Credits

If only these three species of things are ever bought and sold, then it certainly follows that only six kinds of commercial exchanges are possible to be found in the world, namely these:—

Though the kinds of possible exchanges are thus very few, the exchanges themselves in one or other of these six forms and in all of them are innumerable on every business day in every civilized country of the globe. And this point is to be particularly noted, that while buying and selling in these forms has been going on everywhere since the dawn of authentic History, it has gone on all the while in ever-increasing volume, it is increasing now more rapidly and variously than ever, and moreover all signs foretell that it will play a larger and still larger part in the affairs of men and nations as this old world gains in age and unity.

Damascus is one of the very oldest cities of the world, and its very name means a "seat of trade." We are told in the Scriptures, that Abraham about 2000 years before Christ went up out of Egypt "very rich in cattle, in silver, and in gold," and the only possible way he could have acquired these possessions was by buying and selling. He afterwards purchased the cave and the field in Hebron for a family burial-place, and "weighed unto Ephron the silver which he had named in the audience of the sons of Heth, four hundred shekels of silver, current money with the merchant." We may notice here, that there were then "merchants" as a class, that silver by weight passed as "money" from hand to hand, and that in the lack of written deeds to land, as we have them, sales were "made sure" before the faces of living men, who would tell the truth and pass on the word. Abraham indeed seems to have given the pitch for the song of trade sung by his descendants, the Jews, from that day to this; for Jacob, his grandson, was a skilled trafficker, not to say a secret trickster, in his bargains; and wherever in the Old World or the New the Jews have been, there have been in fact and in fame busy buyers and sellers.