This document discusses drivers of innovation at the firm level and country level. At the firm level, larger and older firms are generally more innovative than smaller and younger firms, as larger firms have economies of scale that help bear the costs of innovation. Innovation rates also vary by sector, with larger differences between small and large firms in high-tech industries. Government policies can influence the business environment and firms' ability and willingness to innovate by reducing constraints such as corruption, skills shortages, and burdensome regulations. Both internal firm decisions and the external business environment impact a country's overall innovation levels.