Michael Munger on Desires, Morality, and Self-Interest

Episode Summary

Executive Summary: Russ Roberts and Michael Munger explore whether economists should treat preferences as fixed or whether people can cultivate better wants. They contrast standard maximization with Aristotelian, Montesquieu, Hayek, Buchanan, and Rousseau views of morality, habit, law, and character, arguing that virtue can be internalized as part of the objective function rather than merely imposed as constraint.

Main Topics: Economics and Fixed Preferences (Priority: 5/5): Munger explains the standard economic model: preferences are treated as complete, transitive, and largely fixed so economists can analyze choice using prices and income rather than endlessly invoking preference change. Morality as Constraint vs Objective Function (Priority: 5/5): The hosts debate whether morality should be modeled as an external constraint (law, punishment, social sanction) or as something people internalize and come to value, making virtue part of what they want. Aristotle, Habits, and Character Formation (Priority: 5/5): Munger argues that character is built through repeated habits; people inevitably develop virtues or vices, so the real question is what kind of person one becomes through practice and repetition. Hayek, Buchanan, and Constitutional Order (Priority: 4/5): They distinguish law, legislation, and constitution: informal norms and expectations, formal rules, and higher-order institutional design. This framework is used to explain how societies coordinate moral behavior. Wallet Example and Rule Utilitarianism (Priority: 5/5): A found-wallet thought experiment becomes a way to test whether people would keep or return money when no one is watching. Munger uses it to argue for rule-like habits and internalized norms rather than pure incentive maximization. Evolution, Shame, and Social Enforcement (Priority: 4/5): Munger introduces evolutionary psychology and group selection ideas to explain why humans care about morality, feel shame and guilt, and police norms even at personal cost. Personal Development, Education, and Self-Cultivation (Priority: 4/5): The conversation turns personal: Roberts and Munger discuss whether it is better to become more morally disciplined and less impulsive, even if that means sacrificing some immediate pleasures.

Key Arguments: Economists typically model preferences as rational and stable because allowing preference-change to explain everything makes analysis empty; prices and income are better tools for explanation. Calling people selfish in economics does not mean they lack morality; it means they act in accordance with their own preferences, even when those preferences are altruistic. Morality can be modeled either as an external constraint enforced by law and social punishment or as an internalized part of the objective function, where doing right feels good. Aristotle’s view of character implies that repeated choices shape who we become; habits form virtues or vices, so people are always being trained by their own actions. Montesquieu’s idea that liberty exists so humans can do what they ought to will challenges the liberal notion that freedom is simply doing whatever one wants. Hayek’s distinction between evolved law and imposed legislation helps explain how social norms emerge from practice, while Buchanan’s constitutional view emphasizes higher-level rule design. The wallet example shows that many people do not treat morality as just another price-sensitive preference; some actions feel categorically wrong regardless of payoff. Rule utilitarianism helps reconcile freedom and restraint: one may accept rules that occasionally reduce payoff because, on average, they create better lives and better societies. Humans may be evolutionarily predisposed to care about morality, shame, and reputation because these traits were adaptive in small groups and still stabilize larger societies. Cultivating the right habits can make one not just morally better but also happier and more socially trustworthy; virtue is presented as self-interested in a deeper sense.

Data Points: Episode count: 38th appearance - Russ Roberts notes this is Michael Munger’s 38th appearance on Econ Talk, described as a record. Date: February 2nd, 2021 - The episode’s airing date as announced at the start of the transcript. Article date: June 4th, 2019 - Munger’s article 'What Preferences Do You Want?' was published on the AIER website on this date. Age mentioned: 66 years - Munger references his own age while discussing attempts to change his preferences over time. Dunbar number: 150 or so - Used in the evolutionary discussion to describe the approximate size of small groups where reputation tracking works well. Claimed EconTalk archive length: going back to 2006 - Roberts mentions the podcast archives and the long-running nature of the show. Line-cutting cost: 20 seconds - Roberts estimates the immediate practical cost of the woman cutting in line before describing the much larger emotional cost. Money amounts in wallet example: $10, $1,000, $10 million - Munger uses escalating amounts to illustrate whether there is any price at which anyone would keep the wallet. Wine example price: $50 - Munger contrasts spending $50 on a single malt with cheaper alternatives when discussing acquired tastes. Cheap wine example price: $12 goon box / about $4 per bottle - Munger uses an Australian boxed wine example to discuss cultivation of tastes and preferences. Hospital visit example: no numeric value - Referenced as an example where an initially unpleasant moral action can become satisfying through practice.

Pivotal Quotes: "the liberty to do what we ought to will" — Russ Roberts / Montesquieu reference: Used to frame the idea that freedom is valuable when it enables moral self-development rather than mere impulse satisfaction. "the correct way to solve the problem was to inscribe the law on men's hearts" — Jean-Jacques Rousseau (quoted by Munger): Illustrates internalization of morality so that right action becomes habitual rather than externally compelled. "our passions forge our fetters" — Russ Roberts: A Burkean line Roberts uses to argue that unchecked desires can enslave us more than rules do.

Implications: Listeners are encouraged to rethink rationality: good lives may require cultivating tastes, habits, and rules that sometimes override immediate incentives. For economics, the episode suggests richer models of human motivation that include virtue, culture, and identity.