This document discusses income inequality across advanced economies over the past few decades. It finds that while inequality increased significantly in the United States and United Kingdom, it rose only modestly or declined in some continental European countries. The document examines several potential drivers of inequality, including globalization, technological changes, workforce composition changes, and policy changes. Regression analysis found that globalization factors explain only a small portion of the variation in inequality levels between countries. The evolution of inequality is a complex issue with multiple interacting factors playing different roles in different places.