credit, including © notice, is given to the source. Aggregate Impacts of a Gift of Time

Abstract

We thank Sandy Black, Steve Trejo and participants in seminars at several universities and other institutions for their comments. The views expressed herein are those of the authors and do not necessarily reflect the views of the National Bureau of Economic Research. NBER working papers are circulated for discussion and comment purposes. They have not been peerreviewed or been subject to the review by the NBER Board of Directors that accompanies official NBER publications

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