Adam Smith, in Wealth of Nations, Volume II Book II, paragraphs 100 - 103, makes a pointed critique of American colonial paper money, and praise for the Currency Act prohibiting such.
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The paper currencies of North America consisted, not in bank notes payable to the bearer on demand, but in government paper, of which the payment was not exigible till several years after it was issued; and though the colony governments paid no interest to the holders of this paper, they declared it to be, and in fact rendered it, a legal tender of payment for the full value for which it was issued. But allowing the colony security to be perfectly good, a hundred pounds payable fifteen years hence, for example, in a country where interest at six per cent, is worth little more than forty pounds ready money. To oblige a creditor, therefore, to accept of this as full payment for a debt of a hundred pounds actually paid down in ready money was an act of such violent injustice as has scarce, perhaps, been attempted by the government of any other country which pretended to be free. It bears the evident marks of having originally been, what the honest and downright Doctor Douglas assures us it was, a scheme of fraudulent debtors to cheat their creditors. The government of Pennsylvania, indeed, pretended, upon their first emission of paper money, in 1722, to render their paper of equal value with gold and silver by enacting penalties against all those who made any difference in the price of their goods when they sold them for a colony paper, and when they sold them for gold and silver; a regulation equally tyrannical, but much less effectual than that which it was meant to support. A positive law may render a shilling a legal tender for guinea, because it may direct the courts of justice to discharge the debtor who has made that tender. But no positive law can oblige a person who sells goods, and who is at liberty to sell or not to sell as he pleases, to accept of a shilling as equivalent to a guinea in the price of them. Notwithstanding any regulation of this kind, it appeared by the course of exchange with Great Britain, that a hundred pounds sterling was occasionally considered as equivalent, in some of the colonies, to a hundred and thirty pounds, and in others to so great a sum as eleven hundred pounds currency; this difference in the value arising from the difference in the quantity of paper emitted in the different colonies, and in the distance and probability of the term of its final discharge and redemption.
No law, therefore, could be more equitable than the Act of Parliament, so unjustly complained of in the colonies, which declared that no paper currency to be emitted there in time coming should be a legal tender of payment.
Pennsylvania was always more moderate in its emissions of paper money than any other of our colonies. Its paper currency, accordingly, is said never to have sunk below the value of the gold and silver which was current in the colony before the first emission of its paper money. Before that emission, the colony had raised the denomination of its coin, and had, by act of assembly, ordered five shillings sterling to pass in the colony for six and threepence, and afterwards for six and eightpence. A pound colony currency, therefore, even when that currency was gold and silver, was more than thirty per cent. below the value of a pound sterling, and when that currency was turned into paper it was seldom much more than thirty per cent. below that value. The pretence for raising the denomination of the coin, was to prevent the exportation of gold and silver, by making equal quantities of those metals pass for greater sums in the colony than they did in the mother country. It was found, however, that the price of all goods from the mother country rose exactly in proportion as they raised the denomination of their coin, so that their gold and silver were exported as fast as ever.