We model non-drastic technological innovation in a duopoly model with differentiated products. We derive profit functions for both firms which depend on only one variable, the technological gap. As our model derives product demands directly from agent utility we are able to fully describe the welfare effects of innovation. We show that the welfare improvements from innovation come not only as f...

Ground water is regarded as an important source of sweet water because it has less pollution potential and it has high reserve capacity compared with surface water. Therefore, it I necessary to prevent pollution from ground water, considering management of ground water resources in line with quantitative management of water resources. In this research the potential vulnerability of ground water...

introduction water is the most important parameter in the development of human societies. one of the pillars in the development of water resources is the investigation of environmental conditions and environmental compatibility of the project. identification of the areas vulnerable to pollution can play a major role in development strategies. in most areas of iran, located in the arid and semi-...