Submitted on: 04 May 2000.
Revised on: 23 August 2000.
Accepted on: 03 October 2000.
___________________ECONOMICS AND PHILOSOPHY---CAMBRIDGE UNIV PRESS
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Submitted on: 04 July 2015.
Revised on: 17 October 2015.
Accepted on: 14 November 2015.
___________________ECONOMICS AND PHILOSOPHY---CAMBRIDGE UNIV PRESS