This paper collects some results of the authors on minimax estimation of parameters in linear (regression) models disturbed by some nuisance parameters. In contrast to conventional modelling, the disturbances are not specified as random variables but rather as unknown parameters, for which some...

In this paper we investigate the possibilities of Pareto-improving reforms of a pay-as-you-go (PAYG) pension system in a framework of endogenous growth. Belan et al. (1996) propose a transition of a PAYG system to a system of savings--subsidization. We follow this approach and prove that a...