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There is an advantage to strengthening the currency for people in China: It makes their imports cheaper. A clerk counts bank notes in a bank in Nantong, east China's Jiangsu Province. Xinhua /Landov hide caption

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Planet Money

China's Giant Pool Of Dollars

China's foreign-exchange reserves are worth over $3 trillion. That's a problem for China, and for the U.S.

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How many government-owned businesses do you see in this picture? Ed Jones/AFP/Getty Images hide caption

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Yen Jingchang was one of the signers of the secret document. Jacob Goldstein/NPR hide caption

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Demand for quarter, dimes, nickels, and pennies was up this year. AP hide caption

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Dollar coins gathering dust in the Fed's Baltimore brach. John W. Poole/NPR hide caption

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