The pay-as-you-go social security system, burdened by dwindling labour force, can benefit from immigrants, with birth rates that exceed the native-born birth rates. Thus, the social security system effectively provides an incentive to liberalize migration policy through a political-economy...

In the political debate people express the idea that immigrants are good because they can help pay for the old. The paper explores this idea in a dynamic political-economy setup. We characterize sub-game perfect Markov equilibria where immigration policy and pay-as-you-go (PAYG) social security...