What if the world all used the same currency?

John W. Schoen Senior producer • Profile • E-mail

With the value of the dollar jumping up and down against other countries' currencies, what if the world just agreed to use the same currency? It sounds like a simple idea. But like many simple ideas, it would come with all kinds of unintended consequences.

Recently, Chinese leaders argued for the creation of a unified global currency, a concept that has been proposed by a number of academics and political officials in modern economic history. While the idea has certainly not received widespread support, the success of the euro demonstrates that currency unification can work and may even have certain economic benefits. What ramifications might the adoption of a universal currency have on global trade and national economies in general?
— R.Z., New York

The Chinese proposal for a single global currency was part of Beijing’s effort to take a more prominent place among world powers at the recent G20 meeting. And they have legitimate reason to float the idea of replacing the dollar as the “reserve” currency — the medium of exchange used for the majority of financial transactions around the world.

As the holder of some $2 trillion in dollar-denominated savings the Chinese government has reason to be concerned about the long-term strength of the dollar. One time-honored method of reducing large government debt is to gradually inflate the currency to reduce the real value of that debt. That would also devalue that big pile of Chinese savings.

The dollar’s role as a reserve currency also gives the United States a dominant role in the global economy. That also means other countries are subject to U.S. fiscal and monetary policies over which they have no control.

So it’s no surprise that China would like to see another entity — it suggests the International Monetary Fund would be a good choice — issue a single global currency that would be used by all countries in place of the dollar. There would be many advantages to this. But it has about as much chance of happening as the adoption of Esperanto as a common global language.

A nation’s currency serves several purposes, one of which is a global proxy for the depth, strength and productivity of its economy and the stability of its political system.  For all of the problems facing the United States, investors around the world believe the dollar is the safest place to park their wealth. That’s why, for the moment, interest rates on dollar-denominated debt like U.S. Treasuries are so low.

Currencies are also valued based on trade flows; if the Japanese yen is relatively weak compared to the dollar, and American car buyers can buy a higher-end Japanese model for the same price in dollars, they will choose the Japanese car. That means that countries that are more productive generally see the value of their currency strengthen, which gives people who earn wages in that currency more buying power when they buy products priced in other, weaker currencies.

This makes the Chinese proposal for unified currency somewhat ironic, given that for many years, China artificially suppressed the value of its currency, the yuan, to make its products more competitive when priced in other currencies. With a single, unified currency, countries no longer have the luxury of devaluing their local currency to make their product more competitive.

There are other problems with a unified currency — as countries in the Eurozone are learning. Though the first 10 years of sharing a single currency went relatively smoothly, cracks have begun appearing on the continent as the global recession deepens.

One of the original goals of the Euro was to raise the overall productivity of the European economy, as weaker, smaller countries had to become more competitive with larger, stronger countries. In fact, the reverse is true. Weaker countries enjoyed higher purchasing power without having to produce more goods and services. Overall productivity growth slowed in Europe from 1.6 percent a year before the euro to half that pace since.

The Euro also suffers from the fragmented political structure that governs the economy it represents. Since each member country can issue its own debt, the euro is used in 16 different bond markets. Each country sets its own tax and spending policies; some countries now carry debts larger than their gross domestic product. 

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