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Janet Yellen is expected to get the final political nod in the next couple of weeks to chair the U.S. Federal Reserve. So when she signaled in congressional testimony last week that the U.S. economy was still in need of easy money, it was more than a throwaway line to please vetting senators worried about their voters' lack of jobs. Yellen was using her clout to highlight the two main characteristics of the world economy: Recovery in America and elsewhere is not yet durable. And there is no fear that inflation will demand an end to the ultra-low interest rates and money-printing being used to sustain what growth there is. This week's economi