For at least two reasons the past year has been remarkable for competition lawyers and economists in Denmark. Firstly, a new set of merger rules entered into force on 1 October 2010, and secondly, the relatively new leniency rules were seemingly activated when a large construction cartel was uncovered. From an economic point of view, the development was less exciting. The use of economic advice remained concentrated in a few large cases, and the demand for economic advice still lags behind Sweden and especially Norway.