Sir James Steuart, An Inquiry into the Principles of Political Oeconomy…
“ A pound sterling is always a pound sterling, no doubt; but the grains of silver which compose one pound sterling are not the same in number with those which compose every pound sterling. Now, the moment money is realized in the metals, and that the standard measure of value is affixed to them, let them be worn or not, it is very evident that nothing but the grains of the metal in the several pieces can represent the scale by which the coin becomes a measure of value. ”
