The failure of market catallactics in no way denies the following truth: given sufficient knowledge the optimal decisions can always be found by scanning over all the attainable states of the world and selecting the one which according to the postulated ethical welfare function is best. The solution 'exists'; the problem is how to 'find' it.
Paul SamuelsonEven if this advice to portfolio decision makers to drop dead is good advice, it obviously is not counsel that will be eagerly followed. Few people will commit suicide without a push. And fewer still will pay good money to be told to do what is against human nature and self-interest to do.
Paul SamuelsonSuppose it was demonstrated that one out of twenty alcoholics could learn to become a moderate social drinker. The experienced clinician would answer, 'Even if true, act as if it were false, for you will never identify that one in twenty, and in the attempt five in twenty will be ruined.' Investors should forsake the search for such tiny needles in huge haystacks.
Paul Samuelson