The Impact of Economic Freedom on the Black/White Income Gap
利用1980-2010年美国州级数据，研究经济自由（以北美经济自由指数衡量）对黑人家庭与白人家庭中位收入比的影响，发现经济自由与种族收入差距扩大相关。
Using state-level data from 1980-2010 we examine whether economic freedom, as measured by the Economic Freedom of North America Index, has had any impact in increasing or decreasing the ratio of median income for black households to the median income of white households. To our knowledge, there has been no research on racial income disparities and the role that economic freedom might have in alleviating or exacerbating the problem. We find evidence that economic freedom is associated with an increase in the racial income gap.