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Submitted on: 10 October 2003.
Revised on: 03 February 2004.
Accepted on: 16 February 2004.
___________________Journal of the Association of Environmental and Resource Economists
Submitted on: 15 August 2024.
Revised on: 12 November 2024.
Accepted on: 28 December 2024.
___________________Journal of the Association of Environmental and Resource Economists
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