Submitted on: 22 May 1998.
Revised on: 22 June 1998.
Accepted on: 29 June 1998.
OXFORD BULLETIN OF ECONOMICS AND STATISTICS
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Submitted on: 05 June 2003.
Revised on: 14 June 2003.
Accepted on: 06 July 2003.
OXFORD BULLETIN OF ECONOMICS AND STATISTICS
Submitted on: 05 December 2007.
Revised on: 29 December 2007.
Accepted on: 14 January 2008.
OXFORD BULLETIN OF ECONOMICS AND STATISTICS
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http://reply.papertrans.cn/3/239/23884/23884-26.png
Submitted on: 19 August 2012.
Revised on: 26 September 2012.
Accepted on: 21 October 2012.
OXFORD BULLETIN OF ECONOMICS AND STATISTICS
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Submitted on: 16 July 2015.
Revised on: 08 August 2015.
Accepted on: 05 September 2015.
OXFORD BULLETIN OF ECONOMICS AND STATISTICS
Submitted on: 09 October 2016.
Revised on: 22 November 2016.
Accepted on: 01 December 2016.
OXFORD BULLETIN OF ECONOMICS AND STATISTICS