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Submitted by Tim Ogden on

David, in any of these experiments where the intervention seems to be "accelerating" rather than changing outcomes, have you attempted to measure just the cost/benefit of that acceleration? How much does it cost per month, say, to increase the employment rate of Jordanian women, or the start of Sri Lankan businesses, or getting businesses to hire someone? Is that a meaningful and useful way to think about these programs where the effects seeming "wear off"? Is there a useful way to think about the difference between controls "catching up" vs. the treated reverting to the mean?