ABSTRACT This study examines if socioeconomic constituency characteristics are suitable predictors of the remunerated side jobs held by members of parliament (MPs). Utilising a self-compiled and novel dataset on the moonlighting behaviour of 1,408 members of the German Bundestag from 2013 to 2021, I demonstrate that MPs from economically competitive constituencies generate higher private sector side incomes, particularly if they were born in that constituency. Furthermore, the quantitative analysis shows that MPs from highly educated constituencies tend to have lower side incomes. This finding is explained by suggesting that highly educated constituencies pose a credible threat of electoral punishment for bad behaviour, leading MPs to anticipate voter control and thus reducing incentives to engage in moonlighting activities. However, an MP's mandate type moderates this effect, and the results vary significantly depending on the types of side jobs analysed.
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