Volatility and resilience of democratic public-good provision

We examine democratic public-good provision with heterogeneous legislators. Decisions are taken by majority rule and an agenda-setter proposes a level of the public good, taxes, and subsidies. Members are heterogeneous with respect to their benefits from the public good. We find that, depending on the status quo public-good level, the agenda-setter will form a coalition with the agents who most desire, or least desire, the public good, and we may observe 'strange bedfellow' coalitions. Moreover, public-good provision is a non-monotonic function of the status quo public-good level. In the dynamic setting, public-good provision fluctuates endogenously, even if the agenda-setter stays the same over time. Moreover, the more polarized the legislature is, the higher is the volatility of public-good provision and the longer it may take for a society to recover from negative shocks to public-good provision. We illustrate these findings for a two-party system with polarized parties.