To be instrumentally rational is, roughly, to take necessary and effective means to one’s end. For instance, if you decide to give up smoking, it would be instrumentally rational to stop buying cigarettes, and to limit the time you spend around other smokers. It would be irrational not to take any means to this end. Instrumental rationality raises several sets of questions, including: (i) what are the principles of instrumental rationality? (ii) what is the normative status of the principles of instrumental rationality? (iii) might instrumental rationality be all of practical rationality?
Much recent discussion of this topic takes off from Bratman 1987, Broome 1999, and Korsgaard 1997. Kolodny 2005, Raz 2005, and Schroeder 2009 are central contributions to the subsequent debate. A different stream in the literature focuses on decision theory as a theory of instrumental rationality.Gauthier 1986 includes a classic and fairly accessible statement of this idea.
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David Bourget (Western Ontario)
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