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Sorry if you wanted me to write about something else, but the issue I was raising in my post above was NOT identification. That is not to say that I think identification is unimportant; far from it! And I did at least refer readers to other things I have written on the identifying assumptions in studies of microfinance, including the seminal study by PK. But since you are so keen to make identification the issue, let me emphasize that I am not arguing against the use of RCTs per se (and I do use them myself at times). I do, however, question whether RCTs deserve the status that their recent followers in development economics have given them, particularly when we face so many large knowledge gaps that cannot be addressed with RCTs. Important and interesting questions should drive our development research, not methodological preferences.