Political Dynasties in the UK House of Commons: The Null Effect of Narrow Electoral Selection

Does power persist within families? This article considers whether members of the UK House of Commons with longer legislative careers after 1832 were more likely to establish a political dynasty. Tenure can create opportunities to promote relatives. A regression discontinuity design for re‐election races helps to rule out the confounding influence of inheritable traits. There is no evidence for a causal effect of tenure length on establishing or continuing a dynasty. Established families may have constrained further dynasty development, explaining the null result of tenure.