I thank seminar participants at the NBER Summer Institute, the Brookings Institution, and the Center for Economic Studies for their comments. Mark Roberts made several helpful suggestions regarding an earlier draft. I am also grateful to John Haltiwanger, Rachel Kranton, Mike Pries, Plutarchos Sakellaris, and John Shea for their instruction and guidance. Funding
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Chad Syverson (2004) studied this question.
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