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Submitted on: 28 February 2011.
Revised on: 11 June 2011.
Accepted on: 01 July 2011.
___________________HITOTSUBASHI JOURNAL OF ECONOMICS
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Submitted on: 08 December 2020.
Revised on: 20 February 2021.
Accepted on: 26 March 2021.
___________________HITOTSUBASHI JOURNAL OF ECONOMICS
Submitted on: 27 October 2007.
Revised on: 16 January 2008.
Accepted on: 03 March 2008.
___________________HITOTSUBASHI JOURNAL OF ECONOMICS
Submitted on: 19 February 2011.
Revised on: 28 March 2011.
Accepted on: 22 April 2011.
___________________HITOTSUBASHI JOURNAL OF ECONOMICS
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Submitted on: 31 August 2008.
Revised on: 14 December 2008.
Accepted on: 23 January 2009.
___________________HITOTSUBASHI JOURNAL OF ECONOMICS