The paper studies the current COVID-19 pandemic by applying an adapted epidemiologic model, where each individual is in one of the five states 'susceptible', 'infected', 'removed', 'immune healthy' or 'dead'. We extend the basic model with time-invariant transition rates between these states by...

We present a model of natural resources and growth that stresses the influence of an incomplete circularity of exhaustible natural resources. In particular, we analyze the recycling process and the material balance principle, two fundamental aspects of a circular economy. When market failures...

We study quantity and price competition in heterogeneous triopoly markets where two firms are commonly owned by institutional shareholders, whereas the third firm is owned by independent shareholders. With such a mixed ownership structure, the common owners have an incentive to coordinate their...

Compatibility of network products is an important issue in markets for communication technology as well as hard- and software products. Empirical findings suggest that firms competing in these markets typically choose intermediate degrees of product compatibility. We present a strategic...

We study oligopolistic competition in product markets where the firms' quantity decisions are delegated to managers. Some firms are commonly owned by shareholders such as index funds whereas the other firms are owned by independent shareholders. Under such an asymmetric ownership structure, the...

We analyze product market competition between firm owners where the risk-neutral workers decide on their efforts and, thereby, on the output levels. Various worker compensation schemes are compared: a piece-rate compensation scheme as a benchmark when workers' output performance is verifiable,...