Rule Rationality vs. Act Rationality Robert Aumann The Center for Rationality The Hebrew University, Jerusalem The Fifth European Conference On Complex.

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Rule Rationality vs. Act Rationality Robert Aumann The Center for Rationality The Hebrew University, Jerusalem The Fifth European Conference On Complex Systems Jerusalem, September 2008

a. Bees, flowers, and nectar (Andreas Bertch, circa 1985, unpublished) Q: Actually, why would you expect rationality from a bee? A: EVOLUTION – survival of the fittest (explain) IRRATIONAL

b. The Ultimatum Game (Güth et al, 1981) Two people must divide DM They are in separate rooms, do not know each other, and interact only this one time. A designated one, the offerer, makes an offer. The other one, the responder, may either accept or reject. If he accepts, the amount is divided accordingly. If not, no one gets anything.

Results: Most offers were or more generous, and were accepted. Some offers were 80-20, and were rejected. This is Possible explanations: PRIDE, SELF-RESPECT, INSULT, REVENGE. Irrelevant explanations: REPUTATIONAL EFFECTS IRRATIONAL

Rule Utilitarianism vs. Act Utilitarianism John Harsanyi John Stuart Mill Fyodor Dostoyevsky Jeremy Bentham In making ethical judgments, should one consider the RULE? (“Thou shalt not murder”) – or the ACT (“Is this murder justified?”) In either case, judgments are made on a UTILITARIAN basis (i.e., maximum welfare of society)

Rule Rationality vs. Act Rationality In making decisions, should one consider the RULE? (“Stick to what you’ve learned”) – or the ACT (“How do you get nectar?”) In either case, judgments are made on an EGOTISTIC basis (i.e., maximum individual welfare)

In the Ultimatum Game: Should one consider the RULE? Don’t let people kick you in the stomach! – or the ACT Should I take DM 20 or nothing? Q: These are not ethical, philosophical issues. Why shouldn’t I just maximize my welfare? What’s the importance of the “RULE”? But

A: Rule Rationality is a POSITIVE notion, not a NORMATIVE one (unlike Rule Utilitarianism). Rationality is an expression of evolutionary forces, which work by the RULE, not the exception, not the contrived situation. BEES & FLOWERS ULTIMATUM GAME Nature develops mechanisms that are RULE RATIONAL

Mechanisms BEES & FLOWERS Learning window ULTIMATUM GAME PRIDE, SELF-RESPECT, INSULT, REVENGE

Other Examples: Hunger & enjoyment of food Bees & orchids Enjoyment of sex Polls – giving the “right” answer (Yonatan) Camerer’s taxi drivers Arrow’s Pacific Island story Room temperature Probability matching – Choosing a route to get to work (Dreze) Repeated prisoner’s dilemma Recency Professor Selten’s Umbrella