http://reply.papertrans.cn/1/22/2187/2187-11.png
http://reply.papertrans.cn/1/22/2187/2187-12.png
http://reply.papertrans.cn/1/22/2187/2187-13.png
http://reply.papertrans.cn/1/22/2187/2187-14.png
http://reply.papertrans.cn/1/22/2187/2187-15.png
http://reply.papertrans.cn/1/22/2187/2187-16.png
Submitted on: 22 February 2002.
Revised on: 03 May 2002.
Accepted on: 24 May 2002.
___________________APPLIED ECONOMICS LETTERS---ROUTLEDGE JOURNALS, TAYLOR & FRANCIS LTD
Submitted on: 04 July 2018.
Revised on: 17 October 2018.
Accepted on: 21 November 2018.
___________________APPLIED ECONOMICS LETTERS---ROUTLEDGE JOURNALS, TAYLOR & FRANCIS LTD
Submitted on: 09 June 2020.
Revised on: 12 July 2020.
Accepted on: 10 August 2020.
___________________APPLIED ECONOMICS LETTERS---ROUTLEDGE JOURNALS, TAYLOR & FRANCIS LTD
http://reply.papertrans.cn/1/22/2187/2187-20.png