NEW YORK ( TheStreet) -- On Tuesday, the Commerce Department announced third-quarter GDP growth was 2.5%. Burdened by a rapidly growing trade deficit, U.S. growth remains too slow to bring down unemployment.

Growth is too slow, and unemployment is kept unacceptably high by surging imports, especially from China and Germany, which enjoy undervalued currencies.

U.S. unemployment will stay near 10% until governments in China and elsewhere end policies that purposely undervalue their currencies to boost exports, growth and employment by imposing slow growth and unemployment on the U.S. and other economies. Alternatively, Washington and others could take measures to offset Germany's and China's currency manipulation.

Since June 2009, the U.S. economy has expanded at a 2.9% annual rate. Annual growth in the range of 3% is needed just to keep the U.S. unemployment rate steady -- one percentage point to accommodate labor force growth and two percentage points to offset productivity growth. Growth of 4% or 5% is needed to pull down unemployment by one or two percentage points each year.

More than a year into the recovery, the economy should be expanding at about a 5% annual rate; however, growth is dragging along below 3% because of the surge in imports from countries whose governments engineer undervalued currencies.

Consumers and businesses are spending again, adding 1.4 and 2.3 percentage points to the annual growth rate. Increases in government purchases of goods and services added another 0.3 percentage points. However, too much of what consumers and businesses spend goes to imports from countries with undervalued currencies, and the growing U.S. trade deficit subtracts 1.0 percentage points from growth.

But for the growth in the trade deficit, U.S. unemployment would be 8.2% instead of 9.6% percent. Were the trade deficit cut in half, it would fall to 6% or less.

U.S. imports and unemployment are kept high by a dollar that is overvalued against the currencies of big exporters. These currencies are kept cheap, not by private investment in the U.S. financed by foreign private savings, but by purposeful government intervention in currency markets designed to bolster domestic growth at the expense of the United States and other free traders.

The worst malefactors are China and Germany. China spends 35% of its export revenues buying U.S. dollars to keep its yuan, and this subsidizes its sales into the U.S. by a like amount. This unfair advantage far exceeds the benefits bestowed by its cheap labor.

Germany benefits from an undervalued euro for its economy by being grouped with Spain, Portugal, Ireland, Greece and perhaps Italy, whose fiscal woes pull down the euro.

Were Germany on an independent Deutsche Mark, its currency would trade much higher against the dollar than the euro, Germany's trade surpluses with the U.S. and its southern neighbors would be much smaller, and the fiscal woes of those southern countries would be much more manageable.

Overall, without currency realignments -- especially a stronger yuan and currency reform in Europe -- the U.S. economy cannot grow at the pace that will pull down unemployment, and the nations of southern Europe and Ireland will need perpetual bailouts or face default on sovereign debt.

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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.