Kevin J. Boyle, F. Reed Johnson, Daniel W. McCollum, William H. Desvousges, Richard W. Dunford, Sara P. Hudson, Valuing Public Goods: Discrete versus Continuous Contingent-Valuation Responses, Land Economics, Vol. 72, No. 3 (Aug., 1996), pp. 381-396
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Boyle et al. (1996) studied this question.