Arbitrage and Rational Decisions - Nau, Robert; - Prospero Internetes Könyváruház

Arbitrage and Rational Decisions

 
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Kiadó: Chapman and Hall
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Rövid leírás:

This unique book offers a new approach to the modeling of rational decision making under conditions of uncertainty and strategic and competition interactions among agents. 

Hosszú leírás:

This unique book offers a new approach to the modeling of rational decision making under conditions of uncertainty and strategic and competition interactions among agents. It presentsa unified theory in whichthemost basic axiom ofrationality istheprincipleofno-arbitrage,namelythatneitheranindividualdecisionmakernorasmallgroup of strategiccompetitorsnora largegroupofmarket participantsshould behaveinsuch a wayasto providearisklessprofitopportunitytoanoutsideobserver.


 


Both those who work in the finance area and those who work in decision theory more broadly will be interested to find that basic tools from finance (arbitrage pricing and risk-neutral probabilities) have broader applications, including the modeling of subjective probability and expected utility, incomplete preferences, inseparable probabilities and utilities,  nonexpected utility, ambiguity, noncooperative games, and social choice. Key results in all these areas can be derived from a single principle and essentially the same mathematics.


 


A number of insights emerge from this approach.  One is that the presence of money (or not) is hugely important for modeling decision behavior in quantitative terms and for dealing with issues of common knowledge of numerical parameters of a situation. Another is that beliefs (probabilities) do not need to be uniquely separated from tastes (utilities) for the modeling of phenomena such as aversion to uncertainty and ambiguity. Another over-arching issue is that probabilities and utilities are always to some extent indeterminate, but this does not create problems for the arbitrage-based theories.


 


One of the book?s key contributions is to show how noncooperative game theory can be directly unified with Bayesian decision theory and financial market theory without introducing separate assumptions about strategic rationality. This leads to the conclusion that correlated equilibrium rather than Nash equilibrium is the fundamental solution concept.


 


The book is written to be accessible to advanced undergraduates and graduate students, researchers in the field, and professionals.

Tartalomjegyzék:

1       Introduction


1.1        Social physics


1.2        The importance of having money


1.3        The impossibility of measuring beliefs


1.4        Risk-neutral probabilities


1.5        No-arbitrage as common knowledge of rationality


1.6        A road map of the book


2       Preference axioms, fixed points, and separating hyperplanes


2.1        The axiomatization of probability and utility


2.2        The independence axiom


2.3        The difficulty of measuring utility


2.4        The fixed point theorem


2.5        The separating hyperplane theorem


2.6        Primal/dual linear programs to search for arbitrage opportunities


2.7        No-arbitrage and the fundamental theorems of rational choice


3       Subjective probability


3.1        Elicitation of beliefs


3.2        A 3-state example of probability assessment


3.3        The fundamental theorem of subjective probability


3.4        Bayes? theorem and (not) learning over time


3.5        Incomplete preferences and imprecise probabilities


3.6        Continuous probability distributions


3.7        Prelude to game theory: no-ex-post-arbitrage and zero probabilities


4       Expected utility


4.1        Elicitation of tastes


4.2        The fundamental theorem of expected utility


4.3        Continuous payoff distributions and measurement of risk aversion


4.4        The fundamental theorem of utilitarianism (social aggregation)


5       Subjective expected utility


5.1        Joint elicitation of beliefs and tastes


5.2        The fundamental theorem of subjective expected utility


5.3        (In)separability of beliefs and tastes (state-dependent utility)


5.4        Incomplete preferences with state-dependent utilities


5.5        Representation by sets of probability/utility pairs


6       State-preference theory, risk aversion, and risk-neutral probabilities


6.1        The state-preference framework for choice under uncertainty


6.2        Examples of utility functions for risk-averse agents


6.3        The fundamental theorem of state-preference theory


6.4        Risk-neutral probabilities and their matrix of derivatives


6.5        The risk aversion matrix


6.6        A generalized risk premium measure


6.7        Risk-neutral probabilities and the Slutsky matrix


7       Ambiguity and source-dependent risk aversion


7.1        Introduction


7.2        Ellsberg?s paradox and smooth non-expected-utility preferences


7.3        Source-dependent utility revealed by risk-neutral probabilities


7.4        A 3x3 example of a two-source model


7.5        The second-order-uncertainty smooth model


7.6        Discussion


7.7        Some history of non-expected-utility


8       Noncooperative games


8.1        Introduction


8.2        Solution of a 1-player game by no-arbitrage


8.3        Solution of a 2-player game by no-arbitrage


8.4        Games of coordination: chicken, battle of the sexes, and stag hunt


8.5        An overview of correlated equilibrium and its properties


8.6        The fundamental theorem of noncooperative games


8.7        Examples of Nash and correlated equilibria


8.8        Correlated equilibrium vsNash equilibrium and rationalizability


8.9        Risk aversion and risk-neutral equilibria


8.10    Playing a new game


8.11    Games of incomplete information


8.12    Discussion


9       Asset pricing


9.1        Introduction


9.2        Risk-neutral probabilities and the fundamental theorem


9.3        The multivariate normal/exponential/quadratic model


9.4        Market aggregation of means and covariances


9.5        The subjective capital asset pricing model (CAPM)


10    Summary of the fundamental theorems and models


10.1    Perspectives on the foundations of rational choice theory


10.2    Axioms for preferences and acceptable bets


10.3    Subjective probability theory


10.4    Expected utility theory


10.5    Subjective expected utility theory


10.6    State-preference theory and risk-neutral probabilities


10.7    Source-dependent utility and ambiguity aversion


10.8    Noncooperative game theory


10.9    Asset pricing theory


11    Linear programming models for seeking arbitrage opportunities


11.1    LP models for arbitrage in subjective probability theory


11.2    LP model for for arbitrage in expected utility theory


11.3    LP model for for arbitrage in subjective expected utility theory


11.4    LP model for ex-post-arbitrage and correlated equilibria in games


11.5    LP model for arbitrage in asset pricing theory


12    Selected proofs


Bibliography


Index