Market power and systematic risk

This paper examines the relationship between market power variables and the systematic risk, beta, of a firm. The study controls for the effects of dividend policy, liquidity, and earnings growth. Market power is measured by firm size (both sales and assets), proportion of industry sales, and the industry's four-firm concentration ratio. The study finds only a weak relationship between individual firm market power and firm risk, but there is evidence of a strong negative relationship between industry concentration and the market risk of the firms in an industry. This indicates that firms in concentrated industries experience lower capital costs than firms in less-concentrated industries. The existence of limit pricing is suggested as an explanation for this finding.