The 20th-century history of the world monetary order can be divided into nine phases. Let us examine each in turn.

Phase I: The Classical Gold Standard, 1815–1914

We can look back upon the "classical" gold standard, the Western world of the 19th and early 20th centuries, as the literal and metaphorical Golden Age. With the exception of the troublesome problem of silver, the world was on a gold standard, which meant that each national currency (the dollar, pound, franc, etc.) was merely a name for a certain definite weight of gold. The "dollar," for example, was defined as 1/20 of a gold ounce, the pound sterling as slightly less than 1/4 of a gold ounce, and so on. This meant that the "exchange rates" between the various national currencies were fixed, not because they were arbitrarily controlled by government, but in the same way that one pound of weight is defined as being equal to sixteen ounces.