As President Obama heads for the G-20, Germany and others cry foul about U.S. quantitative easing (QE2 in popular jargon).

Seldom has the G-20 been treated to such hypocrisy.

The Federal Reserve last Wednesday announced plans to purchase $600 billion in U.S. Treasuries. Pushing liquidity into bond markets will lower interest rates on mortgages and business loans, and hopefully boost demand for U.S. goods and lower unemployment.

Since 1995, China has done the same on a grander scale. To keep its currency about 40% below its market value against the dollar, it prints yuan to purchase dollars, and then purchases U.S. Treasuries. That makes Chinese exports artificially cheap, and powers a huge trade surplus and 10% economic growth.

Inexpensive Chinese goods at Wal-Mart ( WMT - Get Report) come at a steep, hidden cost. They destroy U.S. factory jobs that are not replaced by new employment to make exports.

At the October meetings of the International Monetary Fund, Germany and Japan rebuked U.S. requests for help in persuading China to stop intervening in currency markets. That was hardly surprising, as both profit from currency mercantilism too.

Through the 1980s and 1990s, the Bank of Japan intervened in currency markets to keep the yen, and auto exports, artificially cheap. Subsequently, it imposed near zero interest rates, and encouraged private investors to borrow yen, convert those to dollars and then purchase higher yielding U.S. Treasuries in a disguised variant of China's manipulation.

After the Federal Reserve moved to near zero rates too, Japan made clear that it will intervene in currency markets should the yen fall too far, spooking speculators from betting on yen appreciation.

The German scheme is more complex.

Exchange rates translate the whole register of prices for goods and services in each country into the dollar, which is the international yardstick for pricing products and debt.

Germany is in the eurozone with Portugal, Ireland, Greece, and Spain, countries whose economies are less efficient than Germany's and where sovereign debt is suspect. The risk one of their governments will default pulls down the value of the euro.

Were the eurozone to split up, the value of the new Deutsche mark-- and resulting dollar prices for German products on world markets -- would be much higher than the current euro-dollar rate implies. Conversely, dollar prices for the new currencies of Greece and others would be much lower, and competitiveness of their products much stronger on world markets, than the current euro-dollar rate indicates.

The eurozone permits Germany a de facto undervalued currency and huge trade surplus, and to lecture Mediterranean nations and the United States about the virtues of Teutonic thrift. Meanwhile, weaker eurozone economies labor under de facto overvalued currencies and punitive austerity.

U.S. consumers and businesses are spending again but too much goes into imports instead of creating American jobs. Since the recovery began, the combined U.S. trade deficits with China, Japan and Germany is up $127 billion and now totals $448 billion.

With the Gang of Three stonewalling on currency talks, the U.S. economy is growing well below potential and unemployment hovers near 10%. Now, the United States has resorted to QE2.

The United States should tax purchases of yen, yuan and euro used to import goods from those three economies. Set it at about 40% until the Gang of Three agrees to acceptable exchange rate reforms.

At a recent dinner for Western financial ministers, Treasury Secretary Timothy Geithner was told the Americans don't matter anymore.

Such a tax would inspire a different tune -- perhaps, "God Bless America" -- and a pilgrimage to Washington to strike a deal.

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Professor Peter Morici, of the Robert H. Smith School of Business at the University of Maryland, is a recognized expert on economic policy and international economics. Prior to joining the university, he served as director of the Office of Economics at the U.S. International Trade Commission. He is the author of 18 books and monographs and has published widely in leading public policy and business journals, including the Harvard Business Review and Foreign Policy. Morici has lectured and offered executive programs at more than 100 institutions, including Columbia University, the Harvard Business School and Oxford University. His views are frequently featured on CNN, CBS, BBC, FOX, ABC, CNBC, NPR, NPB and national broadcast networks around the world.