Krugman says China's inflation is raising labor costs in China, and in this way gradually reducing the undervaluation of the yuan vs the dollar. But he cautions this would take a long time, 4-5 years. The U.S. faces the costs of high unemployment close to 10% today, and this requires serious efforts now to reduce the undervaluation. It alone will not solve America's problems. It is one of a number of actions that need to be taken and not put off again.