The Demand for Unobservable and Other Nonpositional Goods. Frank, R. H. The American Economic Review, 75(1):101–116, 1985.
bibtex   
@article{Frank2013a,
	Author = {Frank, Robert H.},
	Journal = {The American Economic Review},
	Number = {1},
	Pages = {101--116},
	Title = {The Demand for Unobservable and Other Nonpositional Goods},
	Volume = {75},
	Year = {1985}}

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