There are some famous natural experiments out there, such as the Dutch Hunger Winter study or the Oregon Health Insurance study. Or how about that nighttime satellite photo of North and South Korea showing the benefits of democratic capitalism vs. totalitarian communism. That may be the most famous and instructive natural experiment of all.
Silicon Valley may be giving us another enlightening comparison. Twitter is banning all political advertising, while Facebook will continue to run such ads — even those containing false or misleading claims. We should get a first read on the results on either the evening of Nov. 3 or the morning of Nov. 4, 2020.More