In this paper a theoretical model of the impact of product and process innovations on output, capacity utilization, employment and prices is developed. The model is estimated with a unique set of micro-data from West German manufacturing firms. The empirical results reveal that innovative firms are more successful. They show a higher utilization and more output and employment growth than non-innovative firms. Innovations also change market behaviour. In sectors with a large share of product innovators, firms more often change employment and less often change prices, i.e. product innovations reduce price competition.