Note 3 — Chapter VIII · How the People on the Island Came to Use Currency in the Place of Money.
Reading edition
The value of most commodities, even in a perfect condition, furthermore differs so much by reasons of mere locality, that there could be no possible uniformity in the value of the receipt for the deposit of one and the same article, issued by banks in different places, to serve as currency; the value or purchasing power of a ton of coal, or a fat ox, being one thing at the mouth of a coal-mine or on a prairie stock-farm, and quite a different thing ten, twenty, or a hundred miles distant. But in the case of gold, the space needed to store up what represents a vast value is very small, while the value or purchasing power of gold not only is, but is certain to remain, on the average, very constant all the world over.3