The purpose of this paper is to derive a Rao's efficient score statistic for testing for heteroscedasticity in an error components model with only individual effects. We assume that the individual effect exists and therefore do not test for it. In addition, we assume that the individual effects,...

The Swiss authorities plan to reduce the currently excessively high taxes on bioethanol. We argue that a fair tax treatment of ecological fuels could lead to a rapid development in their use in the next few years. For this to be the case, Switzerland would however have to open up its market to...

This paper analyzes the important time variation in U.S. aggregate portfolio allocations. To do so, we first use flexible descriptions of preferences and investment opportunities to derive optimal decision rules that nest tactical, myopic, and strategic portfolio allocations. We then compare...

We study the impact of an anticipated "baby boom" in an overlapping generations economy. The rise of the working population lowers the wage, and the high demand for assets causes a rise in the price of capital which will be reversed when the baby boomers leave the work-force. However, the swings...