The United States has been running a trade surplus for a long time, and a lot of countries have become use to the idea that the States are always there to buy up all of their stuff. But that’s being turned on its head: many foreign currencies and related exchange traded funds (ETFs), have been strengthening against the dollar and the U.S. is starting to consume less.

Voicing concerns over the fast-appreciating euro, French President Nicolas Sarkozy recently stated that the “monetary disorder” has become “unacceptable” and the eurozone  may soon become restricted by an overvalued currency, writes Michael Pettis for Wall Street Pit. France is unable to change its own rates to adjust for their appreciating currency because the European euro is tied to a centralized European bank that makes all the decisions. [More on the euro.]

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The U.S. dollar can’t depreciate against Asian currencies because of Central Banks that intervene to keep their currencies on par with the greenback, but the dollar will depreciate against floating currencies like the euro. Export-dependent Asian countries have been heavily buying the dollar, but if they were to switch over to the euro then the euro will still appreciate against the U.S. dollar. The dollar will remain a world reserve currency as long as the United States is willing to accept large trade deficits, which consequently allows the dollar to stay weaker.

Naoto Kan, Japan’s new Finance Minister, retracted his call for a weaker yen after the Prime Minister argued for the yen’s strength to be determined by market forces. Nevertheless, Kan believes it is his job to act against currency moves so as to boost competitiveness in Japanese exports.

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Currency experts have noted that China should consider appreciating the yuan  as a way to protect China’s economy from short-term foreign capital inflows. A researcher at the Chinese Academy of Social Sciences suggests a one-time appreciation of 10% against the dollar to reduce inflows of speculative capital. Zhang Xiaoquiang, deputy head of China’s top planning agency, has stated that the loose monetary policies in developed countries, a depreciating U.S. dollar and China’s economic recovery will put pressure on the yuan to appreciate. [More on the Chinese yuan.]

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Opponents of RMB revaluation insist that trade balances will still be the same in Asia. A greater exchange rate flexibility in China may restrain growth of exports in China, but it would force China to develop its domestic markets. However, the lower exports out of China will only induce other exporting Asian countries to pick up the slack left off by China.

For more information on world currencies, visit our currency category. Also, take a look at our Guide to Currency ETFs for more ETF picks.

Read the disclaimer, Tom Lydon is a board member of Rydex Funds.

Max Chen contributed to this article.