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Submitted on: 01 January 1999.
Revised on: 31 March 1999.
Accepted on: 22 May 1999.
___________________Annual Review of Economics---ANNUAL REVIEWS
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Submitted on: 22 September 2019.
Revised on: 29 October 2019.
Accepted on: 20 November 2019.
___________________Annual Review of Economics---ANNUAL REVIEWS
Submitted on: 24 April 2013.
Revised on: 01 July 2013.
Accepted on: 13 July 2013.
___________________Annual Review of Economics---ANNUAL REVIEWS