Submitted on: 23 May 2007.
Revised on: 05 July 2007.
Accepted on: 24 July 2007.
NULL
Submitted on: 23 December 2005.
Revised on: 16 January 2006.
Accepted on: 26 January 2006.
Seoul Journal of Economics---SEOUL NATL UNIV, INST ECONOMIC RESEARCH
Submitted on: 11 April 2010.
Revised on: 24 April 2010.
Accepted on: 11 May 2010.
NULL
Submitted on: 09 October 2004.
Revised on: 24 October 2004.
Accepted on: 16 November 2004.
NULL
http://reply.papertrans.cn/3/279/27845/27845-15.png
http://reply.papertrans.cn/3/279/27845/27845-16.png
http://reply.papertrans.cn/3/279/27845/27845-17.png
http://reply.papertrans.cn/3/279/27845/27845-18.png
http://reply.papertrans.cn/3/279/27845/27845-19.png
http://reply.papertrans.cn/3/279/27845/27845-20.png