The discussion about world currency has a long history. With the expansion of international trade and the collapse of the gold standard system, especially after the collapse of the Bretton Woods system, countries are looking for or hastening the emergence of new world reserve currencies other than the United States dollar. The rise of the yen and the birth of the euro are the result of the competition in the international reserve currency market.
However, it is ultimately up to the market to decide who can truly become the core reserve currency. According to the statistics of the International Monetary Fund, in 2007, the proportion of US dollar assets in global reserve assets was still as high as 60%, and the US dollar was still the leading international reserve currency.
The biggest problem of using sovereign currency as reserve currency is that the policy of the issuing country of the currency must take into account the liquidity of domestic and international markets at the same time, while maintaining the relative stability of the currency value, which is contradictory in some cases. In order to avoid a deep recession in the domestic economy, the US government had to adopt loose fiscal and monetary policies, which increased the concern of countries that use the US dollar as a reserve currency. The discussion about finding a world currency heated up again.
After the Second World War, there was a dispute between Keynes and White when reshaping the international monetary system, and the latter won. On the surface, White represents the interests of the United States, and his victory represents the undisputed hegemony of the post-war American economy. In fact, this is also the result of market choice. The U.S. economy and trade account for a large proportion of the world, and its currency is relatively stable, making it difficult to compete with it.