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« Newcomb's Paradox: Reversing Causality? | Main | America by the Numbers »

27 October 2006

Potential outcomes and equilibrium analysis

Mike Kellermann

Here's a question (alright, a bleg) for any economist-types out there: can you recommend any articles or books that integrate the potential outcomes framework for causal inference with the type of equilibrium analysis that is usually used in microeconomic modeling? I'm not exactly looking for cases where someone says "my comparative statics say the effect should be positive and, voila, it is!", but rather an applied article in which the potential outcomes arise naturally from the structure of the model. Or, even better, something more philosophical that attempts to integrate the potential outcomes approach with equilibriumist models of behavior. A quick Google Scholar search on "potential outcomes", "causal inference", and "equilibrium" only bring up about 80 hits, many of which appear to be by James Heckman, so any pointers to more sympathetic treatments would be appreciated!

Posted by Mike Kellermann at October 27, 2006 10:30 AM

Comments

How about Angrist, Graddy, and Imbens? Disclaimer: I haven't read the paper.

Posted by: Reduced Form at October 27, 2006 1:03 PM

Google is right, most of the work on this topic comes from the "Heckman family". The topic is discussed in Heckman Lalonde & Smith (1999, Handbook of Labour Economics). Here are some other articles that may be relevant:

http://papers.nber.org/papers/w6426
http://ideas.repec.org/p/iza/izadps/dp758.html
http://ideas.repec.org/p/qed/wpaper/1074.html

Posted by: Structural Model at October 28, 2006 5:49 AM

Would you consider non-deterministic computational models leading to an equilibrium condition an example of "potential outcomes arising naturally from the model"?

Posted by: Tom at October 29, 2006 3:28 PM

Thanks for the links above (btw, if you post enough links in a comment, our spam filter picks it up and holds if for approval - sorry about that Structural Model). Tom, I'm not sure whether the computational models that you describe would meet the somewhat ambiguous criterion that I proposed. That is in part because I'm not sure what a successful attempt to embed the potential outcomes framework in an equilibrium model would look like. For example, in the Angrist, Graddy, and Imbens article linked above, the treatment as I understand it is (plausibly) exogenous variation in the availability of fresh fish due to weather conditions etc., which the authors use to estimate demand equations. A cool idea, don't get me wrong, but in some ways external to the model. I wonder, if one takes both the potential outcomes framework and an equilibrium approach to modeling behavior, whether it is basically impossible to estimate (and possibly to define) causal effects of human actions if we assume that those actions are taken by rational maximizers, since Y(0) is only observed off the equilibrium path. If this is the case (and I'm just throwing it out there), it would be kind of ironic given the criticism of manipulationist views of causality as being too human-centered.

Posted by: Mike Kellermann at October 30, 2006 11:54 AM

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