The Wealth of Nations by Part 2 Chapter 2 Page 131

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.