Currency power : understanding monetary rivalry

Monetary rivalry is a fact of life in the world economy. Intense competition between international currencies like the US dollar, Europe's euro, and the Chinese yuan is profoundly political, going to the heart of the global balance of power. But what exactly is the relationship between currency and power, and what does it portend for the geopolitical standing of the United States, Europe, and China? Popular opinion holds that the days of the dollar, long the world's dominant currency, are numbered.