Dynamic modeling is general and recently the most interesting perspective to solve a dynamic economic problem based on Pontryagin’s maximum principle. Moreover traditional economic theory, up to the middle of twentieth century, builds up the production functions regardless the inputs’...

Dynamic modeling is general and recently the most interesting perspective to solve a dynamic economic problem based on Pontryagin's maximum principle. Moreover traditional economic theory, up to the middle of twentieth century, builds up the production functions regardless the inputs' scarcity....

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...