Submitted on: 09 April 2019.
Revised on: 03 June 2019.
Accepted on: 15 June 2019.
___________________ECONOMETRICA---WILEY
http://reply.papertrans.cn/1/80/7904/7904-32.png
http://reply.papertrans.cn/1/80/7904/7904-33.png
Submitted on: 16 May 2017.
Revised on: 10 August 2017.
Accepted on: 21 August 2017.
___________________ECONOMETRICA---WILEY
http://reply.papertrans.cn/1/80/7904/7904-35.png
Submitted on: 10 April 2009.
Revised on: 11 July 2009.
Accepted on: 08 August 2009.
___________________ECONOMETRICA---WILEY