Is welfare economics still possible, when preferences are endogenously determined? The answer is yes, if and only if the hypothesis of adaptive preferences is correct. If preferences satisfy the conditions of continuity, non-satiation and regularity, then adaptive preferences imply that...

In this paper I demonstrate that a reasonable welfare theoretic concept of progress can be made consistent with the assumption of endogenously changing preferences as long as these preference changes correspond to the pattern of adaptive preferences. The main theorem of the paper shows that...