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Submitted on: 27 September 1998.
Revised on: 23 October 1998.
Accepted on: 07 November 1998.
Studies in Economics and Finance
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http://reply.papertrans.cn/3/289/28874/28874-34.png
Submitted on: 19 December 2023.
Revised on: 02 January 2024.
Accepted on: 25 January 2024.
Studies in Economics and Finance
Submitted on: 20 February 2002.
Revised on: 28 March 2002.
Accepted on: 10 April 2002.
Studies in Economics and Finance