An uniformity of weights and measures, arranged upon mathematical principles, would be a benefit to the whole commercial world, if it were wise enoug… - Jean-Baptiste Say

With no fixed opinions in relation to the causes of public prosperity, the nation, like a ship without chart or compass, was driven about by the caprice of the winds and the folly of the pilot, alike ignorant of the place of her departure or destination.

Dominion by land or sea will appear equally destitute of attraction, when it comes to be generally understood, that all its advantages rest with the rulers, and that the subjects at large derive no benefit whatever.

Wherefore it is impossible to succeed in comparing wealth of different eras or different nations. This, in political economy, like squaring the circle in mathematics, is impracticable, for want of a common mean or measure to go by.