America is the world’s most prosperous large country, but critics often attempt to tarnish that title by claiming income is distributed less equally in the U.S. than in other developed countries. These critics point to data from the Organization for Economic Cooperation and Development, which ranks the U.S. as the least equal of the seven largest developed countries. American progressives often weaponize statistics like these to urge greater redistribution. But the OECD income-distribution comparison is biased because the U.S. underreports its income transfers in comparison to other nations. When the data are adjusted...