With their output surging as a result of the big-city tilt of the decade’s “winner-take-most” economy, Democratic districts have seen their median household income soar in a decade—from $54,000 in 2008 to $61,000 in 2018. By contrast, the income level in Republican districts began slightly higher in 2008, but then declined from $55,000 to $53,000. Underlying these changes have been eye-popping shifts in economic performance. Democratic-voting districts have seen their GDP per seat grow by a third since 2008, from $35.7 billion to $48.5 billion a seat, whereas Republican districts saw their output slightly decline from $33.2 billion to $32.6 billion.
Democratic districts, for example, have grown significantly more dynamic in the last decade. Overall, “blue” territories have seen their productivity climb from $118,000 per worker in 2008 to $139,000 in 2018 as recent demographic changes and electoral sorting ensured they became better educated and more urban. Republican-district productivity, by contrast, remains stuck at about $110,000, reflecting only slight improvements of bachelor’s degree attainment and Republicans’ increasingly non-metro domain.
Link to Brookings Institute report