Submitted on: 01 March 2007.
Revised on: 08 April 2007.
Accepted on: 23 April 2007.
Portuguese Economic Journal
Submitted on: 25 November 2015.
Revised on: 05 December 2015.
Accepted on: 16 December 2015.
Portuguese Economic Journal
http://reply.papertrans.cn/3/252/25103/25103-23.png
http://reply.papertrans.cn/3/252/25103/25103-24.png
http://reply.papertrans.cn/3/252/25103/25103-25.png
Submitted on: 28 April 1999.
Revised on: 29 May 1999.
Accepted on: 24 June 1999.
Portuguese Economic Journal---SPRINGER HEIDELBERG
Submitted on: 11 May 2010.
Revised on: 17 June 2010.
Accepted on: 29 June 2010.
Portuguese Economic Journal
http://reply.papertrans.cn/3/252/25103/25103-28.png
Submitted on: 29 September 2011.
Revised on: 25 October 2011.
Accepted on: 18 November 2011.
Portuguese Economic Journal
http://reply.papertrans.cn/3/252/25103/25103-30.png