the ten sixpences now, and I will give you the crown-piece in a year;" it is very evident that this new proposition alters the claims and advantages of the bargain; that it alters the proportion of the two services. Does it not appear plainly enough, in fact, that Peter asks of Paul a new and an additional service; one of a different kind? Is it not as if he had said, "Render me the service of allowing me to use for my profit, for a year, five shillings which belong to you, and which you might have used for yourself?" And what good reason have you to maintain that Paul is bound to render this especial service gratuitously; that he has no right to demand anything more in consequence of this requisition; that the State ought to interfere to force him to submit? Is it not incomprehensible that the economist, who preaches such a doctrine to the people, can reconcile it with his principle of the reciprocity of services? Here I have introduced cash; I have been led to do so by a desire to place, side by side, two objects of exchange, of a perfect and indisputable equality of value. I was anxious to be prepared for objections; but, on the other hand, my demonstration would have been more striking still, if I had illustrated my principle by an agreement for exchanging the services or the productions themselves.
Suppose, for example, a house and a vessel of a value so perfectly equal that their proprietors are disposed to exchange them even-handed, without excess or abatement. In fact let the bargain be
