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FC Talks: Thomas Christiano, "The Duality of Practical Reason"

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FC Talk Christiano

When

12:30 – 1:30 p.m., Oct. 23, 2025

Where

Join us for an engaging talk by Thomas Christiano. This event will take place in Social Sciences 224 from 12:30 PM to 1:30 PM. Don’t miss this opportunity to gain valuable insights and participate in a stimulating discussion!

Location

Social Sciences Building, Room 224
1145 E South Campus Drive
Tucson, Arizona 85721

Online Attendance

Join the talk online!

Title
The Duality of Practical Reason

Abstract
In this paper it is argued that practical reason has two fundamentally different components: individualistic reasons for action (which are reasons connected with actions that make a significant moral or prudential difference) and non-individualistic reasons for actions (reasons for actions that do not make a significant difference by themselves but are such that a large collection of such actions make a significant difference). The thesis is similar in some respects to Sidgwick’s dualism of practical reason, though individualistic reasons need not be self-interested and non-individualistic reasons need not be moral or altruistic. Three arguments are proposed for non-individualistic reasons for action: one that is directly connected to the existence of collective goods; a second that connects non-individualistic reasons to individual plans of action in which no individual action makes a significant difference; a third argument showing that various commonly accepted principles such as fair play in large number cases presuppose non-individualistic reasons for action.

The paper then discusses how non-individualistic reasons can trump various individualistic reasons for action. The question is how to produce a kind of obligation to act non-individualistically as might be the case in a duty to vote and in the case of the duty to obey the law.

Finally, discussion is devoted to some of the deep puzzles of non-individualistic reasons such as their tendency to generate sorites problems and the truly fundamental question as to how non-individualistic reasons interact with individualistic reasons.

Bio
Tom Christiano is a Professor of Philosophy at the University of Arizona. His teaching and research focus on moral and political philosophy with emphases on democratic theory, distributive justice, and global justice.