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Thanks for your thoughtful comment. RCTs can evaluate government programs (Progresa in Mexico was a government program). But the bulk of the experiments discussed in the Glennerster-Kremer paper were not government programs, but rather experiments (run by NGOs) to test individual behavioral responses. Nevertheless, RCTs can be extremely valuable to governments if they were to assess different types of delivery mechanisms or different institutional arrangements. For instance, you could compare delivering education through a voucher scheme with one where the central government finances and provides education. These different delivery mechanisms often address the "government failure" associated with real-world public policies, so RCTs that shed light on overcoming such failures could make a major contribution.