Given n independent and identically distributed observations in a set G with an unknown function g, called a boundary or frontier, it is desired to estimate g from the observations. The problem has several important applications including classification and cluster analysis, and is closely...

The Danish "Klima 2020" plan sets an ambitious target for the complete phasing-out of fossil fuels by 2050. The Danish energy sector currently accounts for 40% of national CO2 emissions. Based on an extended Farrell input distance function that accounts for CO2 as an undesirable output, we...

A detailed analysis of the German productivity development is indispensable for understanding, why Europe is lagging behind the US growth since the mid 1990s. In this paper a new and unique database is used to analyze the sources of German productivity growth since 1970. It is shown that...

A new legislation in the German electricity market requires the implementation of an incentive-based regulation within the next years. In such a regime either prices or revenuesare capped and grow with the inflation rate minus a factor, which accounts for productivitydifferences between the...