We analyse competition between two firms (ISPs) in the retail market for broadband access. One of the firms is vertically integrated and controls the input market for local access. The vertically integrated firm undertakes ...

Small pelagic fish like sardine, anchovy and herring feed on zooplankton and are in turn prey for fish higher up in the food chain. They are therefore expected to play a vital role in transfer of energy between levels ...

I denne antologien har jeg samlet et utvalg skriftlige arbeider, blant i alt i overkant av hundre med smått og stort, som jeg har forfattet i perioden 2004 – 2016; noen sammen med andre. I utvalget har jeg lagt vekt på ...

What ethical criterion for intergenerational justice should be adopted, e.g., when faced with the task of managing the global environment? Koopmans’ axiomatization of discounted utilitarianism is based on seemingly compelling ...

Using spatial and temporal variation in openings of fast food restaurants in Norway between 1980 and 2007, we study the effects of changes in the supply of high caloric nutrition on the health and cognitive ability of young ...

The paper employs a model of dynamic price competition to study how international commodity taxation affects the stability of collusive agreements when producers in an international duopoly agree not to export into ...

We study the competitive effects of combination therapies in pharmaceutical markets, which crucially hinge on the additional therapeutic value of combinatory use of drugs and the therapeutic substitutability with the most ...

Taxes affect the individual’s educational choice through many channels, and they have both direct and indirect effects on human capital accumulation. The structure of the tax system creates different incentive effects ...

Two-sided platform firms serve distinct customer groups that are connected through interdependent demand, and include major businesses such as the media industry, banking, and the software industry. A well known result ...