Seminar paper from the year 2005 in the subject Economics - Industrial Economics, grade: A, International Business School Budapest , course: Industrial Organziations, language: English, abstract: In this paper the article "The fall in British electricity prices: market rules, market structure, or both?" from Natalia Fabra and Juan Toro will be summarized first, mentioning the argumentation concerning their research and the contribution of the findings to theoretical or empirical knowledge. Subsequently, conclusions made in the article "How sweet it is" by Dennis W. Carlton and Jeffrey M. Perloff, are examined stressing the theoretical model of performance measurement with regard to the Lerner Index which both papers are based on.