Submitted on: 08 July 2012.
Revised on: 01 November 2012.
Accepted on: 28 November 2012.
___________________International Journal of Applied Behavioral Economics
Submitted on: 07 January 2004.
Revised on: 27 February 2004.
Accepted on: 13 April 2004.
___________________International Journal of Applied Behavioral Economics
Submitted on: 07 April 2007.
Revised on: 29 May 2007.
Accepted on: 13 July 2007.
___________________International Journal of Applied Behavioral Economics
Submitted on: 16 February 2018.
Revised on: 22 March 2018.
Accepted on: 01 May 2018.
___________________International Journal of Applied Behavioral Economics
Submitted on: 19 July 2012.
Revised on: 10 October 2012.
Accepted on: 15 November 2012.
___________________International Journal of Applied Behavioral Economics
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Submitted on: 10 November 2019.
Revised on: 01 December 2019.
Accepted on: 19 December 2019.
___________________International Journal of Applied Behavioral Economics
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Submitted on: 19 February 1999.
Revised on: 13 June 1999.
Accepted on: 16 July 1999.
___________________International Journal of Applied Behavioral Economics