I have a subscription. The entire remainder of the article discusses it haha. Let see if I can paraphrase: 1) framing the economic experiment is difficult to prevent bias (my take: economics is not in a lab), 2) what works in Kenya might not work in Guatemala (my take: confounding factors are much greater), 3) ethics of withholding benefits to a group, 4) rich country researchers assuming they can and should intervene in poor country's problems, 5) rich country researchers don't have local context, 5) small experiments and small topics may not apply to or have an impact on a global scale which economics operates at.
