Hamilton's Rule and Its Discontents

Abstract
In an incendiary 2010 Nature article, M. A. Nowak, C. E. Tarnita, and E. O. Wilson present a savage critique of the best-known and most widely used framework for the study of social evolution, W. D. Hamilton’s theory of kin selection. More than a hundred biologists have since rallied to the theory’s defence, but Nowak et al. maintain that their arguments ‘stand unrefuted’. Here I consider the most contentious claim Nowak et al. defend: that Hamilton’s rule, the core explanatory principle of kin selection theory, ‘almost never holds’. I first distinguish two versions of Hamilton’s rule in contemporary theory: a special version (HRS) that requires restrictive assumptions, and a general version (HRG) that does not. I then show that Nowak et al. are most charitably construed as arguing that HRS almost never holds, while HRG buys its generality at the expense of explanatory power. While their arguments against HRS are fairly uncontroversial, their arguments against HRG are more contentious, yet these have been largely overlooked in the ensuing furore. I consider the arguments for and against the explanatory value of HRG, with a view to assessing what exactly is at stake in the debate. I suggest that the debate hinges on issues concerning the causal interpretability of regression coefficients, and concerning the explanatory function Hamilton’s rule is intended to serve.
Keywords kin selection  inclusive fitness  Hamilton's rule  evolutionary game theory  Price equation  explanation  causation  unification
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Reprint years 2014
DOI 10.1093/bjps/axt016
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References found in this work BETA
A Priori Causal Models of Natural Selection.Elliott Sober - 2011 - Australasian Journal of Philosophy 89 (4):571 - 589.
The Propensity Interpretation of Fitness.Susan K. Mills & John H. Beatty - 1979 - Philosophy of Science 46 (2):263-286.
Can There Be A Priori Causal Models of Natural Selection?Marc Lange & Alexander Rosenberg - 2011 - Australasian Journal of Philosophy 89 (4):591 - 599.

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Citations of this work BETA
Gene Mobility and the Concept of Relatedness.Jonathan Birch - 2014 - Biology and Philosophy 29 (4):445-476.
The Relation Between Kin and Multilevel Selection: An Approach Using Causal Graphs.S. Okasha - 2016 - British Journal for the Philosophy of Science 67 (2):435-470.
Multi-Level Selection and the Explanatory Value of Mathematical Decompositions.Christopher Clarke - 2016 - British Journal for the Philosophy of Science 67 (4):1025-1055.
Towards an Evolutionary Developmental Biology of Cooperation?Tobias Uller & Heikki Helanterä - 2014 - Studies in History and Philosophy of Science Part C: Studies in History and Philosophy of Biological and Biomedical Sciences 48:267-271.

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