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Income Inequality and Political Polarization: Time Series Evidence Over Nine Decades
Author(s) -
Duca John V.,
Saving Jason L.
Publication year - 2016
Publication title -
review of income and wealth
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.024
H-Index - 57
eISSN - 1475-4991
pISSN - 0034-6586
DOI - 10.1111/roiw.12162
Subject(s) - polarization (electrochemistry) , inequality , economic inequality , economics , econometrics , politics , income inequality metrics , conjecture , mathematics , political science , law , mathematical analysis , chemistry , pure mathematics
Rising income inequality and political polarization have led some to hypothesize that the two are causally linked. Properly interpreting such correlations is complicated by multiple factors driving these phenomena, potential feedback between inequality and polarization, measurement issues, and the statistical challenges of modeling non‐stationary variables. We find that a more precise measure of inequality (the inverted P areto– L orenz coefficient) is more consistently and statistically related to polarization in the short and long runs than the less precise top 1 percent share of income. We find bi‐directional causality between polarization and inequality, consistent with theoretical conjecture and less formal evidence in previous studies.