113 research outputs found
Common reasoning in games: a Lewisian analysis of common knowledge of rationality
The game-theoretic assumption of ‘common knowledge of rationality’ leads to paradoxes when rationality is represented in a Bayesian framework as cautious expected utility maximisation with independent beliefs (ICEU). We diagnose and resolve these paradoxes by presenting a new class of formal models of players’ reasoning, inspired by David Lewis’s account of common knowledge, in which the analogue of common knowledge is derivability in common reason. We show that such models can consistently incorporate any of a wide range of standards of decision-theoretic practical rationality. We investigate the implications arising when the standard of decision-theoretic rationality so assumed is ICEU.Common reasoning; common knowledge; common knowledge of rationality; David Lewis; Bayesian models of games
Common reasoning in games: A Lewisian analysis of common knowledge of rationality
The game-theoretic assumption of common knowledge of rationality leads to paradoxes when rationality is represented in a Bayesian framework as cautious expected utility maximisation with independent beliefs (ICEU). We diagnose and resolve these paradoxes by presenting a new class of formal models of players' reasoning, inspired by David Lewis's account of common knowledge, in which the analogue of common knowledge is derivability in common reason. We show that such models can consistently incorporate any of a wide range of standards of decision-theoretic practical rationality. We investigate the implications arising when the standard of decision-theoretic rationality so assumed is ICEU
Moral Judgments in Social Dilemmas: How Bad is Free Riding?
In the last thirty years, economists and other social scientists have investigated people’s normative views on distributive justice. Here we study people’s normative views in social dilemmas, which underlie many situations of economic and social significance. Using insights from moral philosophy and psychology we provide an analysis of the morality of free riding. We use experimental survey methods to investigate people’s moral judgments empirically. We vary others’ contributions, the framing (“give-some” vs. “take-some”) and whether contributions are simultaneous or sequential. We find that moral judgments of a free rider depend strongly on others’ behaviour; and that failing to give is condemned more strongly than withdrawing all support.moral judgments, moral psychology, framing effects, public goods experiments, free riding
Moral Judgments in Social Dilemmas: How Bad is Free Riding?
In the last thirty years, economists and other social scientists have investigated people’s normative views on distributive justice. Here we study people’s normative views in social dilemmas, which underlie many situations of economic and social significance. Using insights from moral philosophy and psychology we provide an analysis of the morality of free riding. We use experimental survey methods to investigate people’s moral judgments empirically. We vary others’ contributions, the framing (“give-some” vs. “take-some”) and whether contributions are simultaneous or sequential. We find that moral judgments of a free rider depend strongly on others’ behaviour; and that failing to give is condemned more strongly than withdrawing all support.moral judgments, moral psychology, framing effects, public goods experiments, free riding
Comparison‐specific preferences:The attentional dilution effect for delay and risk
In cross-modal decisions, the options differ on many attributes, and in uni-modal decisions, they differ on few. We supply new theory and data to understand how discounting for both delay and risk differs between cross-modal and uni-modal decisions. We propose the attentional dilution effect in decision making in which (a) allocation of limited attention to an attribute determines that attribute's decision weight and (b) the attention an attribute receives is increasing in the difference between options on that attribute and decreasing in the number of other attributes that differ between options. We introduce the random order delayed compensation method and conduct two experiments focusing on delayed and risky receipt of consumer goods. Consistent with the attentional dilution effect, we find that in this domain, patience and risk tolerance are generally higher in cross-modal than uni-modal decisions. We suggest that, since many real-world choices are cross-modal, people may be more patient and risk-tolerant in their everyday life than is suggested by standard lab experiments
Conditional Cooperation and Betrayal Aversion
We investigate whether there is a link between conditional cooperation and betrayal aversion. We use a public goods game to classify subjects by type of contribution preference and by belief about the contributions of others; and we measure betrayal aversion for different categories of subject. We find that, among conditional cooperators, only those who expect others to contribute little to the public good are significantly betrayal averse, while there is no evidence of betrayal aversion for those who expect substantial contributions by others. This is consistent with their social risk taking in public goods games, as the pessimistic conditional cooperators tend to avoid contribution to avoid exploitation, whereas the optimistic ones typically contribute to the public good and thus take the social risk of being exploited
Conditional cooperation and betrayal aversion
We investigate whether there is a link between conditional cooperation and betrayal aversion. We use a public goods game to classify subjects by type of contribution preference and by belief about the contributions of others; and we measure betrayal aversion for different categories of subject. We find that, among conditional cooperators, only those who expect others to contribute little to the public good are significantly betrayal averse, while there is no evidence of betrayal aversion for those who expect substantial contributions by others. This is consistent with their social risk taking in public goods games, as the pessimistic conditional cooperators tend to avoid contribution to avoid exploitation, whereas the optimistic ones typically contribute to the public good and thus take the social risk of being exploited
Conditional Cooperation and Betrayal Aversion
We investigate whether there is a link between conditional cooperation and betrayal aversion. We use a public goods game to classify subjects by type of contribution preference and by belief about the contributions of others; and we measure betrayal aversion for different categories of subject. We find that, among conditional cooperators, only those who expect others to contribute little to the public good are significantly betrayal averse, while there is no evidence of betrayal aversion for those who expect substantial contributions by others. This is consistent with their social risk taking in public goods games, as the pessimistic conditional cooperators tend to avoid contribution to avoid exploitation, whereas the optimistic ones typically contribute to the public good and thus take the social risk of being exploited
Common reasoning in games: a Lewisian analysis of common knowledge of rationality
Abstract: We present a new class of models of players’ reasoning in non-cooperative games, inspired by David Lewis’s account of common knowledge. We argue that the models in this class formalise common knowledge of rationality in a way that is distinctive, in virtue of modelling steps of reasoning; and attractive, in virtue of being able to represent coherently common knowledge of any consistent standard of individual decision-theoretic rationality. We contrast our approach with that of Robert Aumann (1987), arguing that the former avoids and diagnoses certain paradoxes to which the latter may give rise when extended in particular ways
On preference imprecision
Recent research invokes preference imprecision to explain violations of individual decision theory. While these inquiries are suggestive, the nature and significance of such imprecision remain poorly understood. We explore three questions using a new measurement tool in an experimental investigation of imprecision in lottery valuations: Does such preference imprecision vary coherently with lottery structure? Is it stable on repeat measurement? Does it have explanatory value for economic behaviour? We find that imprecision behaves coherently, shows no tendency to change systematically with experience, is related to choice variability, but is not a main driver of the violations of standard decision theory that we consider
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