Should two-band income taxes be progressive given a general income distribution? Weprovide a negative answer under utilitarian and max-min welfare functions. While this resultclarifies some ambiguities in the literature, it does not rule out progressive taxes in general. Ifwe maximize total or...

This note deals with a harvesting model for a single stock fishery. In the case of small pelagic fish it seems reasonable to consider harvest functions depending nonlinearly on fishing effort and on fish stock. Empirical evidence about these fish species suggests that marginal catch does not...

We present a control problem for an electrical vehicle. Its motor can be operated in two discrete modes, leading either to acceleration and energy consumption, or to a recharging of the battery. Mathematically, this leads to a mixed-integer optimal control problem (MIOCP) with a discrete...