China has bought more than $1 trillion in American debt, but as the global downturn has intensified, Beijing is starting to keep more of its money at home - a shift that could pose some challenges to the U.S. government in the near future but eventually may even produce salutary effects on the world economy.
"All the key drivers of China's Treasury purchases are disappearing," said Ben Simpfendorfer, an economist in the Hong Kong office of the Royal Bank of Scotland. "There's a waning appetite for dollars and a waning appetite for Treasuries. And that complicates the outlook for interest rates."