Chinese Savings Helped Inflate American Bubble

In March 2005, a low-key Princeton economist who had become a Federal Reserve governor coined a novel theory to explain the growing tendency of Americans to borrow from foreigners, particularly the Chinese, to finance their heavy spending.

The problem, he said, was not that Americans spend too much, but that foreigners save too much. The Chinese have piled up so much excess savings that they lend money to the United States at low rates, underwriting American consumption.