"In our recent research, we document that mirroring the general rise in income inequality (documented by Piketty and his collaborators, among many others), ther

"In our recent research, we document that mirroring the general rise in income inequality (documented by Piketty and his collaborators, among many others), there has been a similar concentration in individual campaign contributions. Figure 2 shows that the share of campaign contributions coming from the richest ten percent of Census tracts went from about 40% of the total in 1980 to almost 55% in 2020. Meanwhile, the share of the bottom fifty percent of tracts halved, from almost 30% to less than 15%."