摘要 : Purpose This is a longitudinal study exploring the effect of ISO 9000 certification on firm's financial performance in the pre-crisis period and the 2008 financial crisis period. Design/methodology/approach The empirical analysis ... 展开 Purpose This is a longitudinal study exploring the effect of ISO 9000 certification on firm's financial performance in the pre-crisis period and the 2008 financial crisis period. Design/methodology/approach The empirical analysis is based on a 22-year dataset with balance sheet data from 136 Greek listed firms covering the period 1992-2013. A matching technique is applied to properly estimate potential differences in the impact of ISO 9000 on firm's financial performance between the groups of certified and matched non-certified (control) firms in the entire period but, most importantly, in pre-crisis vs crisis periods, using the difference-in-differences econometric approach. Findings The findings indicate that certified firms exhibit significantly higher financial performance relative to the matched non-certified group in both the pre-crisis and crisis periods, which tends to persist for several years post-certification. The financial crisis has a negative and statistically significant effect on firm performance in both the certified and matched non-certified groups, which nevertheless did not differ significantly between them. Controlling for sectoral and technological differences did not harm the higher performance of certified firms relative to the matched control peers. The results remain in the same direction when the authors test the ISO 9000 effect in the sub-group of certified firms that obtained the certification at the firm-level. Originality/value The study is original in its sample design and hypothesis testing. The matched sample created from a sufficiently long and continuous time dataset enabled the authors to properly estimate firm performance differences of ISO 9000 between pre-crisis and crisis periods. Of additional value is the testing of sectoral/technological differences and the distinction between firm-level and plant-level certification. 收起