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Submitted on: 10 October 1998.
Revised on: 01 February 1999.
Accepted on: 11 February 1999.
___________________CESifo Economic Studies---OXFORD UNIV PRESS
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Submitted on: 19 January 2025.
Revised on: 11 April 2025.
Accepted on: 22 April 2025.
___________________CESifo Economic Studies---OXFORD UNIV PRESS
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Submitted on: 03 March 2009.
Revised on: 27 June 2009.
Accepted on: 18 August 2009.
___________________CESifo Economic Studies---OXFORD UNIV PRESS