Research background: Many people in Japan and other countries believe that national finances will not stand still and will go bankrupt if deficits continue at present level. It is like a religion. In this paper, however, we prove that this religion is wrong by using a simple mathematical model....

This paper extends the CES model of monopolistic competition to the case where varieties are both horizontally and vertically differentiated. A distinctive feature of our model is the presence of a network externality, which operates through the number of varieties available at each quality...

This paper examines the interplay between spatial and temporal dimensions of price competition in the hotel industry, where services are non-storable and consumers must book in advance. We study how spatial price competition among hotels evolves across different booking horizons. Using a panel...

This paper extends the CES model of monopolistic competition to the case where varieties are both horizontally and vertically differentiated. A distinctive feature of our model is the presence of a network externality, which operates through the number of varieties available at each quality...

Does it pay to invest in green companies? In countries where a market for carbon is functioning, such as those within the European Union, our findings suggest that it should be beneficial. Using a sample of green and brown European firms, we initially demonstrate that green companies have...