This paper develops a framework for the analysis of gatekeeping in tax enforcement, whereby independent auditors are assigned the duty of certifying taxpayers' reports. The equilibrium of the market for gatekeepers' services is characterised, as well as taxpayers' and auditors' optimal...

Nutrient enrichment of marine ecosystems is regarded as a pressing global environmental problem. For certain marine species it may be a mixed blessing, resulting in damaging ecosystem events, but contributing to primary productivity. Consequently, the impact of enrichment on fishery profits may...

There is now increasing recognition that the world's marine ecosystems, especially coastal areas and semi-enclosed seas, are suffering from degradation and modification due to human influences. One of the most serious problems is nutrient enrichment, which in the long term harms productivity and...