One of the most challenging problems to applied industrial economists is the detection of colluding behavior in oligopolistic markets. In this paper we postulate how low market share variability may be used as a primary indicator of cartel success to maintain the agreed upon levels of...

In the context of the recent electricity market reforms in Europe and the US, we evaluate the performance of the Spanish pool. Our method is not based on price-cost estimates but rather on the different behavior of operators with higher market power as compared to the behavior of more...