As mentioned above, in order to minimize the social desirability bias when questioning issues of ethical consumption (fair trade in this case), we used a conjoint measurement of the price consumers were willing to pay when facing a coffee-buying situation in a supermarket (where most coffee types are available and which is the usual shopping place of the large majority of Belgian consumers). In a conjoint analysis, consumers are asked to indicate their preference (in this case their willingness to pay) for products with varying characteristics. By simulating real marketplace situations, conjoint analysis realistically models day-to-day consumer decisions and has a reasonable ability to predict consumer behavior. Consumers show their preferences by making trade-offs between different attributes of a product (Carroll and Green 1995; Green, Krieger, and Wind 2001; Green and Srinivasan 1978). These trade-offs can be decomposed into part-worth utilities and importance weights for each product attribute. In this way, the importance of different attributes or criteria in the consumer's evaluation of the product can be studied (Green, Rao, and Desarbo 1978).