Using Korean firms between 1987 and 2010, we show that non-group firms suffer more from investment inefficiency if they operate in industries where group firms belong to larger business groups. We also find that this effect exists mainly during a period characterized by a capital supply shortage and low cash flow pledgeability to investors. Further analyses indicate that the effect is attributable not to human capital constraints, but external financing constraints imposed by business group firms and that causality runs from business group strength to investment inefficiency of non-group firms.

Using a corporate culture measure based on the textual analysis of the Q&A section of earnings conference calls, we document robust evidence that similar corporate cultural values between supply chain partners improve the financial performance of suppliers. Consistent with the view that supplier–customer cultural similarity facilitates communication, promotes altruistic attitudes, and builds trust between trading partners, we find that culturally similar suppliers experience higher cost efficiency, fewer problems with underinvestment, and better innovation performance. Our results also indicate that cultural similarity benefits customers, although to a lesser extent. Overall, our study sheds new light on how inter-firm cultural similarity influences firm performance along the supply chain.