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We explore the role of ISO 14001 certification in stimulating increased exports for certified firms. The rationale for the study is that certification conveys an important market signal that the certified firm's production process adheres to internationally accepted standards of environmental quality. That is, the perceived credibility of ISO 14001 certification lowers informational barriers about the environmental attributes of the certified firm's products, especially in foreign markets, boosting exports. We put this proposition to an empirical test using the gravity trade model and a panel of South Korean manufacturing industries exporting to 176 countries over the 1988-2015 period. Our results show that ISO 14001 certification generates a robust positive push effect for South Korean manufacturing exports. We further find that this effect varies based on the level of economic development of the destination market, with a more pronounced impact of certification on exports to high-income countries than to middle and lower income countries.

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