http://reply.papertrans.cn/1/68/6744/6744-21.png
http://reply.papertrans.cn/1/68/6744/6744-22.png
Submitted on: 19 November 2003.
Revised on: 19 February 2004.
Accepted on: 15 March 2004.
___________________Cuadernos de Economia---UNIV NAC COLOMBIA, FAC CIENCIAS ECONOMICAS, CUADERNOS ECONOMIA
http://reply.papertrans.cn/1/68/6744/6744-24.png
http://reply.papertrans.cn/1/68/6744/6744-25.png
Submitted on: 30 April 2002.
Revised on: 14 July 2002.
Accepted on: 04 August 2002.
___________________Cuadernos de Economia---UNIV NAC COLOMBIA, FAC CIENCIAS ECONOMICAS, CUADERNOS ECONOMIA
http://reply.papertrans.cn/1/68/6744/6744-27.png
http://reply.papertrans.cn/1/68/6744/6744-28.png
Submitted on: 29 April 2023.
Revised on: 11 August 2023.
Accepted on: 13 September 2023.
___________________Cuadernos de Economia---UNIV NAC COLOMBIA, FAC CIENCIAS ECONOMICAS, CUADERNOS ECONOMIA
Submitted on: 16 November 2023.
Revised on: 05 March 2024.
Accepted on: 07 April 2024.
___________________Cuadernos de Economia---UNIV NAC COLOMBIA, FAC CIENCIAS ECONOMICAS, CUADERNOS ECONOMIA