a nonparametric analysis of investment banks' efficiency in the current global crisis

The purpose of this study is to assess to what extent the business model practiced by investment banks, before the beginning of the financial crisis, has influenced their performance indicators, and especially those who express shareholders' satisfaction. To this end, we have applied a nonparametric method, called Data Envelopment Analysis, which allows obtaining the efficiency scores for each financial institution considered. The sample included two pure investment banks, Lehman Brothers and Goldman Sachs, and seven international financial groups carrying out investment banking activities. The model tested assumed the maximization of selected output variables (ROE and the dividend distributed), by considering several input variables, meant to summarize the risk profile and costs arising from implementing a particular business model. The results obtained, in the form of high inefficiency scores, indicate that the business model of investment banks was not better performing than that applied by financial groups, because it failed to ensure a balance between ownership compensation and sustainable expansion of financial activity.