China's foreign exchange reserves, the largest in the world, reached a record $3.82 trillion last year.

Since China's reserves started accumulating more than a decade ago, the increase has been widely regarded as an encouraging and beneficial development. With China gradually becoming the "world's factory" and posting an increasing trade surplus in the past decade, Chinese reserves ballooned. During that period, the Chinese felt positive about growing reserves. But now they are feeling increasingly nervous about the situation.

Currency reserve to assist liquidity

Managing forex reserves

With the rolling out of the three stages of quantitative easing, the Chinese realized with great disappointment that the real value of their reserves had depreciated considerably due to the United States' monetary policy, which is beyond the Chinese government's control.

The US government budget limit problem last October once again highlighted the possibility of a US default, which would not only affect its creditworthiness and the cost of US government financing but also the value of China's reserves and the confidence of the country, which is the largest investor in US government securities.

Not only would China lose due to the reduced value of its investment in US Treasury notes and related assets, but it also could be criticized for allowing the US government to maintain low interest rates and release unprecedented amounts of liquidity into the global economy.

As finance textbooks would preach in any investment context, to diversify is probably the most effective way to hedge against risks coming from a specific country or asset. Consequently, China should diversify its reserve assets.

China has been trying to diversify those assets during the past few years. According to US Treasury statistics, US dollar-denominated assets make up about 49 percent of Chinese reserves, down from 69 percent about three years ago.

China's foreign exchange reserve administrators have realized the risks associated with concentrated holdings in US dollar-denominated assets.

China has increased the proportion of Treasury bills in its US dollar-denominated assets, primarily due to its heightened risk of exposure in US government agency securities from the subprime mortgage crisis.