Commentary: The Productivity Boom Is Still A Mystery

Long before he dreamed of studying economics, Alan Greenspan studied box scores. Growing up in New York, the future Federal Reserve chairman honed his statistical skills on the slugging percentages of the Dodger greats. These days, Greenspan may wish economics was more like baseball. The game has changed--but no one revises 1939's batting averages. In economics, the stats get rewritten every year.

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