CIAO DATE: 12/2009
September 2009
Peterson Institute for International Economics
The US dollar is not the world’s key currency by policy design, just as English is not the leading global language by policy design. It is the evolutionary outcome of practice and experience. It would take both a major shock to the dollar and a viable alternative to dislodge it from widespread use. Like a common language, the dollar enjoys “network externalities”— the greater the number of people who use and accept it, the more useful it is to everyone, and the more entrenched it becomes. Also, what is not quite the same thing, the dollar enjoys a large market in low-risk and highly liquid securities, most notably US Treasury bills; the liquidity both enhances and is enhanced by the network externalities. Most of the world’s foreign exchange transactions directly involve the US dollar. It is easy to hold and easy to use, even on a large scale. In short, it is highly convenient.
Resource link: The Future of the Dollar [PDF] - 133K