Among unmitigated rogues, mutual trust is impossible. Among people of absolute integrity, mutual trust would be unlimited. These are truisms. Given a nation made up of liars and thieves, and all trade among its members must be carried on either by barter or by a currency of intrinsic value: nothing in the shape of _promises_-to-pay can pass in place of _actual_ payments; for, by the hypothesis, such promises being never fulfilled, will not be taken. On the other hand, given a nation of perfectly honest men—men as careful of others’ rights as of their own—and nearly all trade among its members may be carried on by memoranda of debts and claims, eventually written off against one another in the books of bankers; seeing that as, by the hypothesis, no man will ever issue more memoranda of debts than his goods and his claims will liquidate, his paper will pass current for whatever it represents. Coin will be needed only as a measure of value, and to facilitate those small transactions for which it is physically the most convenient. These we take to be self-evident truths. From them follows the corollary that in a nation neither wholly honest nor wholly dishonest, there may, and eventually will, be established a mixed currency—a currency {327} partly of intrinsic value and partly of credit-value. The ratio between the quantities of these two kinds of currency, will be determined by a combination of several causes. Supposing that there is no legislative meddling to disturb the natural balance, it is clear from what has already been said, that, fundamentally, the proportion of coin to paper will depend on the average conscientiousness of the people. Daily experience must ever be teaching each citizen, which other citizens he can put confidence in, and which not. Daily experience must also ever be teaching him how far this confidence may be carried. From personal experiment, and from current opinion, which results from the experiments of others, every one must learn, more or less truly, what credit may safely be given. If all find that their neighbours are little to be trusted, but few promises-to-pay will circulate. And the circulation of promises-to-pay will be great, if all find that the fulfilment of trading engagements is tolerably certain. The degree of _honesty_ characterizing a community, being the first regulator of a credit-currency; the second is the degree of _prudence_. Other things equal, it is manifest that among a sanguine, speculative people, promissory payments will be taken more readily, and will therefore circulate more largely, than among a cautious people. Two men having exactly the same experiences of mercantile risks will, under the same circumstances, respectively give credit and refuse it, if they are respectively rash and circumspect. And two nations thus contrasted in prudence, will be similarly contrasted in the relative quantities of notes and bills in circulation among them.