In this study, efficiency levels of 25 manufacturing firms listed in the ISE 100 index are measured for the period before and after the 2008 crisis by Data Envelopment Analysis (DEA). Afterwards, a ranking is made between the firms which are efficient by using super efficient analysis. In the study current ratio, receivables turnover ratio, inventory turnover ratio, long term debt/equity and financial leverage are used as input data and return on asset and return on equity are used as output data in order to analyze input oriented efficiency. As a result of the analysis, only 3 of the firms are found efficient before and after crisis period. Nonetheless, 3 firms were not able to remain efficient during global crisis period
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