861 Int. J Latest Trends Fin. Eco. Sc. Vol‐5 No. 1 March, 2015 Efficiency in Stock Markets with DEA: Evidence from PSI20 Nuno Ferreira#1, Adriano Mendonça Souza*2 # Department of Quantitative Methods, IBS-ISCTE Business School, ISCTE Avenida das Forças Armadas, Lisboa, Portugal
[email protected] * Department of Statistics, Federal University of Santa Maria Roraima Avenue, 100, Santa Maria, RS state, Brazil
[email protected] Abstract - After the US subprime crisis, the first signs of economic efficiency, and technical efficiency. a sovereign debt crisis spread among European Whereas technical efficiency requires only input and financial players. The regulation of the markets by output data, economic efficiency also requires price European Commission and European Central Bank data. The simplest way to differentiate productive and created limitation to obtained great amount of liquidity technical efficiency is to think of productive in commercial banking sector. In this context, the efficiency in terms of cost minimization by adjusting successful survival of some European banks became in a dangerous situation. The present study try to explore the mix of inputs, whereas technical efficiency is the crisis occurred in one of the largest private output maximization from a given mix of inputs. Portuguese banks through the analysis of the efficiency In literature, a large number of papers is based on levels of twenty largest enterprises of the PSI20 since an essentially nonparametric, programming approach 1993. The input variables chosen were market value to analysis of observed outcomes. In fact, the Data and return in a Data Envelopment Analysis model. Envelopment Analysis (DEA) is by far the most used Consistent with earlier studies, the results show methodology to measure efficiency.