How do political elites persist? In this article, I review selected research on who legislators are, how democratic institutions affect their selection and behaviour, as well as their persistence over the long run. The extent to which political elites persist, forms a measure of the level of political inequality between elites and citizens. I argue that political inequality in societies can be measured as the extent to which the same individuals, or families, monopolize political power. This operationalization travels well through space and time. In extreme forms of non-competitiveness, power is passed on within political dynasties, and power becomes essentially hereditary.Democratic competition is meant to break up the extreme political inequality associated with absolute, hereditary politics. We still insufficiently understand the exact institutional reforms under which hereditary political selection declined during European countries' evolution towards representative democracy (e.g. Offerlé, 1993) from the individual interests of those who decided to reform (Benoit, 2004, Capoccia andZiblatt 2010). Yet these questions were crucial for early elite theorists (e.g.Michels ([1911([ ] 1968([ ), Mosca ([1896([ ] 1939) who warned that all power has a tendency to become hereditary. To understand how institutions affect political selection, and long-run political inequality, we need to understand why individuals support (and largely continue to support) 1 the institutional equilibriums that make up their representative democracies. For this non-exhaustive review I draw on examples from the study of political inequality and political selection, broadly defined, and present some of my own recent contributions to this literature, about historical lotteries, legislative elites, and political dynasties in France and Britain. The focus in this work on highly unequal, early democratising countries addresses two important research