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Epstein - Generative Social Science: Studies in Agent-Based Computational Modeling

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Epstein Generative Social Science: Studies in Agent-Based Computational Modeling
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Agent-based computational modeling is changing the face of social science. In Generative Social Science, Joshua Epstein argues that this powerful, novel technique permits the social sciences to meet a fundamentally new standard of explanation, in which one grows the phenomenon of interest in an artificial society of interacting agents: heterogeneous, boundedly rational actors, represented as mathematical or software objects. After elaborating this notion of generative explanation in a pair of overarching foundational chapters, Epstein illustrates it with examples chosen from such far-flung fields as archaeology, civil conflict, the evolution of norms, epidemiology, retirement economics, spatial games, and organizational adaptation. In elegant chapter preludes, he explains how these widely diverse modeling studies support his sweeping case for generative explanation.


This book represents a powerful consolidation of Epsteins interdisciplinary research activities in the decade since the publication of his and Robert Axtells landmark volume, Growing Artificial Societies. Beautifully illustrated, Generative Social Science includes a CD that contains animated movies of core model runs, and programs allowing users to easily change assumptions and explore models, making it an invaluable text for courses in modeling at all levels.

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Princeton Studies in Complexity Simon A Levin Princeton University and - photo 1

Princeton Studies in Complexity

Simon A. Levin (Princeton University)
and Steven H. Strogatz (Cornell University), Editors

Lars-Erik Cederman, Emergent Actors in World Politics:
How States and Nations Develop and Dissolve

Robert Axelrod, The Complexity of Cooperation: Agent-Based Models
of Competition and Collaboration

Peter S. Albin, Barriers and Bounds to Rationality: Essays on Economic
Complexity and Dynamics in Interactive Systems. Edited and with an
introduction by Duncan K. Foley

Duncan J. Watts, Small Worlds: The Dynamics of Networks between
Order and Randomness

Scott Camazine, Jean-Louis Deneubourg, Nigel R. Franks,
James Sneyd, Guy Theraulaz, Eric Bonabeau,
Self-Organization in Biological Systems

Peter Turchin, Historical Dynamics: Why States Rise and Fall

Andreas Wagner, Robustness and Evolvability in Living Systems

Mark Newman, Albert-Laszlo Barabasi, and Duncan Watts, eds.,
The Structure and Dynamics of Networks

J. Stephen Lansing, Perfect Order: Recognizing Complexity in Bali

Joshua M. Epstein, Generative Social Science: Studies in Agent-Based
Computational Modeling

Generative
Social Science

STUDIES IN AGENT-BASED
COMPUTATIONAL MODELING

Joshua M. Epstein

PRINCETON UNIVERSITY PRESS

PRINCETON AND OXFORD

Copyright 2006 by Princeton University Press

Published by Princeton University Press, 41 William Street,
Princeton, New Jersey 08540
In the United Kingdom: Princeton University Press, 3 Market Place, Woodstock,
Oxfordshire OX20 1SY

Requests for permission to reproduce material from
this work should be sent to Permissions,
Princeton University Press.

Library of Congress Cataloging-in-Publication Data
Epstien, Joshua M., 1951
Generative social science: studies in agent-based computational modeling / Joshua M. Epstein
p. cm.(Princeton studies in complexity)
Includes bibliographical references and index.
ISBN-13: 978-0-691-12547-3 (cloth : alk. paper)
ISBN-10: 0-691-12547-3 (cloth : alk. paper)
1. Social sciencesComputer simulation. 2. Social sciencesMathematical models. I. Title. II. Series.
H61.3.E67 2007
300.1'13dc22

2006004238

British Library Cataloging-in-Publication Data is available

This book has been composed in Sabon

Printed on acid-free paper.

pup.princeton.edu

Printed in China

1 3 5 7 9 10 8 6 4 2

For Melissa, Matilda, and Joey

INTRODUCTION

The introduction to Growing Artificial Societies offers the following thought on the future of explanation:

What constitutes an explanation of an observed social phenomenon? Perhaps one day people will interpret the question, Can you explain it? as asking Can you grow it? Artificial society modeling allows us to grow social structures in silico demonstrating that certain sets of microspecifications are sufficient to generate the macrophenomena of interest.We can, of course, use statistics to test the match between the true, observed, structures and the ones we grow. But the ability to grow themis what is new. Indeed, it holds out the prospect of a new, generative, kind of social science.

A concluding section of the same work, entitled Generative Social Science, restates the point even more broadly:

In effect, we are proposing a generative program for the social sciences and see the artificial society as its principal scientific instrument. (177)

This book presents some of the achievements of that, now quite vibrant, program, and illustrates the scope of (at least my own) agent-based computational research since Growing Artificial Societies. Indeed, one candidate title for the present volume was Growing Artificial Societies II. But that book had its own flavor. While it made a substantial number of concrete claims (some of which will be recalled here), it was more a general call to arms than a concerted attack on any particular problem, more methodological than applied, more a laboratory than any particular experiment.

By contrast, the chapters that follow are much more focused studies in particular areas: the history of the Anasazi; the emergence of economic classes; the timing of retirement; the evolution of norms; the dynamics of ethnic conflict; the spread of epidemics, and organizational adaptation among them. While the chapters span the social sciences from archaeology to economics to epidemiology, there is unity to the volume. Indeed, each subsequent chapter illustrates core points made in the overarching methodological statement of As such, the book is more than a collection; it makes an argument.

The Stakes: Explanation

To me, the core of that argument concerns the notion of a scientific explanation. This is really what is at stake, if you will, in the advent of agent-based models: What is to be the accepted standard of explanation in the social sciences? In this book, I define and argue for a generative standard and highlight a toolthe agent-based computational model, or artificial societythat facilitates the construction of scientific models satisfying that standard. The notion of a generative explanation, which was not defined at any length in Growing Artificial Societies, is discussed at length in the opening chapter below, but is encapsulated nicely in the motto: If you didn't grow it, you didn't explain it. Or, under the obvious interpretation of the symbols:

Dynamic Attainment versus Static Existence of Equilibrium This represents a - photo 2

Dynamic Attainment versus Static Existence of Equilibrium

This represents a sharp departure from prevailing practice. While there are notable dynamic exceptions, game theory and mathematical economics (the twin pillars of contemporary social science) are overwhelmingly concerned with equilibria, Nash equilibrium being the most important example. Indeed, in these quarters, explaining an observed social pattern is basically understood to mean demonstrating that it is the Nash equilibrium (or a distinguished Nash equilibrium) of some game. However, these are mere demonstrations of existence. Per se, they do not demonstrate that the configurations of interestthe patterns allegedly explainedare attainable at all, much less attainable on time scales of interest to humans. Moreover, standard equilibrium models impose very stringent demands on the individual's information and computing (optimizing) power. They often ignore space, assume global (not local) interactions, and involve little if any heterogeneity.

To the generativist, this is unsatisfactory; to explain a pattern, it does not suffice to demonstrate thatunder this ensemble of stricturesif society is placed in that pattern, no (rational) individual would unilaterally depart (which is the Nash equilibrium condition). Rather, one must show how a population of boundedly rational (i.e., cognitively plausible) and heterogeneous agents, interacting locally in some space, could actually arrive at the pattern on time scales of interestbe it a wealth distribution, spatial settlement pattern, or pattern of violence. Hence, to explain macroscopic social patterns, we try to grow them in multiagent models.

Nonequilibrium Systems

The preceding critique applies even when the pattern to be explained is an equilibrium. But what if it isn't? What if the social pattern of interest is itself a nonequilibrium dynamic?

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