This paper presents several models of the demand for quality differentiated goods in which the consumer decides which brand of product to select as well as how many units to buy. The models cover a variety of preference structures and can readily be estimated using standard techniques for...

This paper makes an attempt to introduce preference uncertainty into discrete choice models used in contingent valuation experiments. We develop an econometric model which may characterize the degree of the uncertainty and provide an empirical illustration of the suggested model.