Abstract Scholars have long recognized that equality in policy responsiveness is potentially undermined by the existence of economic inequality. However, there is still a lack of empirical research testing whether and how this actually occurs, especially outside of the USA. This study takes up the question whether unequal representation also exists in a country that is in some ways a least-likely case, namely the Netherlands. It does so by linking public opinion to policy on 291 potential policy changes between 1979 and 2012. This reveals, first, that policy responsiveness is much stronger for high incomes than for low or median incomes. Second, an exploration of the underlying causal mechanisms finds support for the role of political participation of wealthier versus poorer citizens, while the socioeconomic background of parliamentarians relative to the broader public does not seem to matter. Corporate lobbying may also contribute to unequal responsiveness.