We present a mechanism based on managerial incentives through which common ownership affects product market outcomes. Firm-level variation in common ownership causes variation in managerial incentives and productivity across firms, which leads to intraindustry and intrafirm cross-market variation in prices, output, markups, and market shares that is consistent with empirical evidence. The organizational structure of multiproduct firms and the passivity of common owners determine whether higher prices under common ownership result from higher costs or from higher markups. Using panel regressions and a difference-in-differences design, we document that managerial incentives are less performance sensitive in firms with more common ownership.
We show theoretically and empirically that managers have steeper financial incentives to expend effort and reduce costs when an industry’s firms tend to be controlled by shareholders with concentrated stakes in the firm, and relatively few holdings in competitors. A side effect of steep incentives is more aggressive competition. These findings inform a debate about the objective function of the firm.