While a mind-altering-substance consumption alleviates current level of depression, it facilitates future depression. Our analysis incorporates this trade off and shows that the stationary state of a consistently overly ambitious sophisticated substance user is improved by impatience, and that...

During the growth process inequality may rise or decline, and the change in the level of inequality may, in turn, affect growth. An increase in inequality in one place and better prospects of growth and earnings elsewhere can trigger migration. As a result of these close affecting links between...