Abstract
This paper proposes a corporate technology stock model which describes a company專 entire activities from RD to sales of the product, and a methodology for determining an appropriate total RD expenditure without using a conventional microscopic bottom-up process. The formula for the determination of the appropriate total RD expenditure is derived from depreciation of corporate technology stock and the corporate management goal (in terms of annual rate of sales expansion). The results of a numerical simulation of formula qualitatively accord with the experience of industry.
