Dec 7, 2010
It has been mentioned before that akrasia might be modeled as the result of inner conflict. I think this analogy is great, and would like to propose a refinement.1
Here's the mental conflict theory of akrasia, as I understand it:
Though Maud appears to external observers (such as us) be a single self, she is in fact a kind of team. Maud's mind is composed of sub-agents, each of whom would like to pursue its own interests. Maybe when Maud goes to bed, she sets the alarm for 6 AM. When it buzzes the next morning, she hits the snooze...again and again and again. To explain this odd behavior, we invoke the idea that BedtimeMaud is not the same person as MorningMaud. In particular, BedtimeMaud is a person who likes to get up early, while MorningMaud is that bully BedtimeMaud's poor victim.The point is that the various decisionmakers that inhabit her brain are not always after the same ball. The subagents that compose the mind might not be mutually antagonistic; they're just not very empathetic to each other.
I like to think of this situation as a collective action problem akin to those we find in political science and economics. What we have is a misalignment of costs and benefits. If Maud rises at 6, then MorningMaud bears the whole cost of this decision, while a different Maud, or set of Mauds, enjoys the benefits. The costs are concentrated in MorningMaud's lap, while the benefits are dispersed among many Mauds throughout the day. Thus Maud sleeps in.
Put differently, MorningMaud's behavior produces a negative externality: she enjoys the whole benefit of sleeping in, but the rest of the day's Mauds bear the costs.
So, how can we get MorningMaud to lie in the bed she makes, as it were, and get a more efficient outcome?
The analogy's not perfect. (I can't see a way to fit in Pigovian taxes .)
But is it a fruitful analogy? Is it more than just renaming the key terms of the subagent theory--could one use welfare economics to improve one's own dynamic consistency?
1I got this idea partly from a slip, possibly Freudian (I think I said "externality" instead of "akrasia"), and partly from this page on the Egonomics website.