Main Bank of China Is in Need of Capital

It has been on a buying binge in the United States over the last seven years, snapping up roughly $1 trillion worth of Treasury bonds and mortgage-backed debt issued by Fannie Mae and Freddie Mac.

Those investments have been declining sharply in value when converted from dollars into the strong yuan, casting a spotlight on the central bank’s tiny capital base. The bank’s capital, just $3.2 billion, has not grown during the buying spree, despite private warnings from the International Monetary Fund.