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Ricketts and Shoesmith 
 
(1) British Economic Opinion, IEA Research paper No 45, 1990 - survey of 1000 economists 
 
(2) AER 1992 
 
B. Frey et al 
 
(1) European Economic Review 1983 
 
(2) Kyklos 1986 
 
(3) Journal of Environmental Economics and Management 1985 
 
Roger Backhouse 
 
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