The Value of Political Power: Estimating Returns to Office in Post-War British Politics Andy Eggers – Harvard University Jens Hainmueller – Harvard University September 2008 Many recent studies show that firms profit from connections to influential politi- cians, but less is known about how much politicians financially benefit from wielding political influence. We estimate the returns to serving in Parliament using original data on the estates of recently deceased British politicians. Ap- plying both matching and a regression discontinuity design to compare MPs with parliamentary candidates who narrowly lost, we find that serving in office almost doubled the wealth of Conservative MPs but had no discernible financial benefits for Labour MPs. Conservative MPs profited from office largely through lucrative outside employment they acquired as a result of their political posi- tions; we show that gaining a seat in Parliament increased the probability that a Conservative politician would later serve as a director of a publicly-traded firm. We suggest that Labour MPs did not profit from office largely because trade unions effectively monopolized the market for political services by controlling the party and its politicians. Our findings provide evidence relevant to a grow- ing theoretical and empirical literature assessing the relationship between the financial rewards of political office and the quality of politicians. Andy Eggers, PhD Candidate, Department of Government, 1737 Cambridge Street, Cambridge, MA 02138. Email:
[email protected]. Jens Hainmueller, PhD Candidate, Department of Government, 1737 Cambridge Street, Cambridge, MA 02138. E-mail:
[email protected]. Authors are listed in alpha- betical order and contributed equally. Both authors are affiliated with Harvard’s Institute for Quantitative Social Science (IQSS).