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Submitted on: 25 October 2008.
Revised on: 13 December 2008.
Accepted on: 09 January 2009.
___________________JOURNAL OF INDUSTRIAL ECONOMICS
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Submitted on: 17 June 2006.
Revised on: 27 July 2006.
Accepted on: 13 September 2006.
___________________JOURNAL OF INDUSTRIAL ECONOMICS
Submitted on: 21 September 2003.
Revised on: 19 October 2003.
Accepted on: 19 November 2003.
___________________JOURNAL OF INDUSTRIAL ECONOMICS
Submitted on: 29 June 1998.
Revised on: 07 August 1998.
Accepted on: 05 September 1998.
___________________JOURNAL OF INDUSTRIAL ECONOMICS
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Submitted on: 23 September 2002.
Revised on: 16 November 2002.
Accepted on: 04 January 2003.
___________________JOURNAL OF INDUSTRIAL ECONOMICS