Immigration might be a remedy against the stress that low fertility causes to demographic and welfare systems. Sustained immigration, however, can alter both the demographic and epidemiological profiles of the receiving population. An age-structured SIR (susceptible-infective-recovered) model...

We exploit a multistate generalisation of a classical, one-sex, stable population model to evaluate structural and long-term effects of changes in the attainment of adulthood. The demographic framework that inspired this paper is provided by Italy, where a strong delay in the transition to...