'This paper discusses theoretically the different incentives of managers versus firm owners to invest in innovative activities. There are opposing effects concerning R and D intensity in the manager-controlled firm. Our study on the determinants of R and D intensity presents empirical results concerning this question. A sample of German firms with 3.978 observations is used and it turns out that the owner-led firms invest less into R and D than the managerial firms. With respect to the manager-led firms, expenditures on R and D depend on the control exerted. If capital shares are widely dispersed and managers are thus only controlled a little by owners, they invest more into R and D. Owner-led firms and managers who are strongly controlled ...