This paper explores the biological evolution of two species of ants, the one referred to as the residents, and the other one as the visitors, both dwelling the same green field. By means of a predator-prey analysis, we take advantage of this parable to get an insight into the mass-tourism...

A model of optimal discounting in presence of non renewable resource extraction is presented here. By means of a two-step optimal control problem, we derive the determinants of the social discount rate that a hypothetical social planner should set to drive the economy towards a path where...

A model of optimal harvesting natural resources is presented to show the appropriate management decision rule a natural-based society should follow to prevent its environment from over-exploitation. This optimal control analysis is likely to produce some changes in the topological structure of...