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The Philosophy of Economic Philosophy
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Economic philosophy examines the foundational questions about value, choice, and institutions that shape economic life. It blends normative and conceptual analysis to ask what economic systems should aim for and how economic terms and models ought to be understood.
Key components:
- Normative aims: What should economies promote? (welfare, justice, freedom, equality, capabilities). Debates include utilitarianism (maximize aggregate welfare), Rawlsian justice (priority to the least advantaged), libertarianism (individual rights and minimal coercion), and capabilities approaches (Sen, Nussbaum).
- Value theory and welfare: How to measure well‑being, utility, preference satisfaction, or capabilities; problems of interpersonal utility comparisons and aggregation.
- Justice and distribution: Principles for fair distribution of resources, opportunities, and burdens (taxation, redistribution, property rights).
- Rationality and decision theory: Models of rational choice, bounded rationality, preferences, and behavioral critiques of standard economic assumptions.
- Markets and institutions: Roles and moral status of markets, market failures, property, contracts, and the legitimacy of market regulation.
- Methodology and epistemology: Nature and limits of economic models, idealization, explanation, prediction, and the relationship between ethics and economics.
- Political economy and ideology: How economic theories reflect and influence political values, power relations, and social norms.
Representative thinkers: Adam Smith (moral sentiments and market mechanisms), Karl Marx (critique of capital and exploitation), John Stuart Mill (liberty and utilitarianism), John Rawls (justice as fairness), Amartya Sen (capabilities), Friedrich Hayek (knowledge and spontaneous order), Milton Friedman (liberal markets), and behavioral economists (Kahneman, Tversky).
Further reading:
- Amartya Sen, "Development as Freedom"
- John Rawls, "A Theory of Justice"
- Adam Smith, "The Theory of Moral Sentiments" and "Wealth of Nations"
- Friedrich Hayek, "The Constitution of Liberty"
(Concise overview; each theme entails extensive debates.)
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Thought · @TomBers
Explain: decision theory
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Decision Theory — A Concise Explanation
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Decision theory is the systematic study of how agents choose among alternatives under conditions of uncertainty or certainty. It asks what choices are rational and provides formal frameworks for representing preferences, beliefs, and options.
Core components
- Acts, States, Outcomes: Acts are available actions; states are possible ways the world might be; outcomes result from pairing acts with states.
- Preferences and Utilities: Preferences rank outcomes; utility functions represent those preferences numerically so choices can be compared.
- Beliefs and Probabilities: When outcomes are uncertain, agents assign probabilities to states; subjective probabilities model personal belief.
- Decision Rules:
- Expected Utility (EU) Maximization: Choose the act that maximizes expected utility (sum of utilities weighted by probabilities). Foundation: von Neumann–Morgenstern axioms.
- Savage’s Subjective Expected Utility: Derives both probabilities and utilities from preferences in uncertain environments.
- Alternatives: Maximin (maximize the worst‑case payoff), minimax regret, prospect theory (descriptive behavioral model by Kahneman & Tversky), and bounded‑rational heuristics.
- Normative vs Descriptive:
- Normative theory prescribes how one should decide (rational choice criteria).
- Descriptive theory explains how people actually decide (systematic biases, heuristics).
- Dynamic Decision Making:
- Sequential decisions use concepts like expected utility conditional on information, Bayesian updating, and dynamic consistency (avoiding preference reversals over time).
- Game Theory Intersection: Strategic decision making when multiple agents interact—Nash equilibrium and related solution concepts.
Key issues and criticisms
- Interpersonal utility comparison and aggregation difficulties.
- Violations of EU axioms in real behavior (Allais paradox, framing effects).
- Choice of probability and utility representation under ambiguity (Ellsberg paradox).
- Bounded rationality: cognitive limits lead to satisficing or heuristic decision rules.
Representative sources
- von Neumann & Morgenstern, Theory of Games and Economic Behavior
- Savage, The Foundations of Statistics
- Kahneman & Tversky, Prospect Theory (1979)
- Gilboa, Theory of Decision Under Uncertainty (survey)
That is decision theory in brief: a formal toolkit for representing and evaluating choices, with both prescriptive standards of rationality and descriptive findings about actual human behavior.
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