Grabowski, Henry; Vernon, John - In: Journal of Evolutionary Economics 10 (2000) 1, pp. 201-215
Since the late 1970s, pharmaceutical R&D has grown at a rapid rate relative to sales and other variables. In this paper, we examine the determinants of pharmaceutical R&D using a pooled data sample of 11 major drug firms over the period 1974 to 1994. We find that expected returns and cash flows...