Chinese Savings Helped Inflate American Bubble

In the past decade, China has invested upward of $1 trillion, mostly earnings from manufacturing exports, into American government bonds and government-backed mortgage debt. That has lowered interest rates and helped fuel a historic consumption binge and housing bubble in the United States.

China, some economists say, lulled American consumers, and their leaders, into complacency about their spendthrift ways.

“This was a blinking red light,” said Kenneth S. Rogoff, a professor of economics at Harvard and a former chief economist at the International Monetary Fund. “We should have reacted to it.”