Common Lenders and Product Market Competition

This paper explores how bank concentration affects product market competition of non-financial firms. We argue that sharing common lenders lowers the cost of debt financing in an industry. Exploiting plausibly exogenous variation in banks' industry market shares stemming from bank mergers, we find that high-market-share lenders charge lower loan rates. This is because common lenders internalize potential adverse effects of higher loan rates on the product market behavior among their competing borrowers. In the aggregate, we show that a higher proportion of firms sharing the same lender and higher credit concentration in an industry lead to lower output. Effects are stronger for industries with competition in strategic substitutes. Our findings support the idea that bank concentration helps firms to achieve less competitive outcomes in the product market.