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Jason, thanks very much for the recommendation... and I totally agree that there is little analog to a strict "placebo effect" in development impact evaluation. That is partly why I am taken right now with the concept of a "meaning response" since it encompasses the "placebo effect" but goes beyond to potentially include other effects where subjects respond to meaning more broadly. One example is the apparent fact that Chinese-Americans are more likely to die on the 4th of the month (4 is an unlucky number), but non-Chinese-Americans are no more likely to die on the 4th of the month... I will have to look for that study to confirm this...