http://reply.papertrans.cn/3/289/28874/28874-21.png
Submitted on: 17 November 2001.
Revised on: 29 November 2001.
Accepted on: 22 December 2001.
Studies in Economics and Finance
http://reply.papertrans.cn/3/289/28874/28874-23.png
http://reply.papertrans.cn/3/289/28874/28874-24.png
Submitted on: 22 April 2022.
Revised on: 22 May 2022.
Accepted on: 28 May 2022.
Studies in Economics and Finance
http://reply.papertrans.cn/3/289/28874/28874-26.png
http://reply.papertrans.cn/3/289/28874/28874-27.png
Submitted on: 05 March 2004.
Revised on: 18 April 2004.
Accepted on: 28 April 2004.
Studies in Economics and Finance
http://reply.papertrans.cn/3/289/28874/28874-29.png
http://reply.papertrans.cn/3/289/28874/28874-30.png