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The Setting of the Problem
The Role of Intellectual Stimuli
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American Petroleum Institute Appendix Table capital goods invention cars chapter chemical coefficient coefficient of determination Column compound locomotive correlation cost cycles decline demand deviations earlier economic effect electrical engineering England equipment existing expected field firms Fourdrinier machines George Stephenson given growth hypothesis important inventions improvement increase independent industries industry's interindustry inventive activity inventive potential knowledge Level of Inventive locomotive long swings machine number of inventions number of patents output paper Patent Office patent statistics patented inventions patents are counted patents granted patents issued patents pending peak percent percentage period petroleum refining plow probably problems production technology railroad patents reflect regressions relation research and development Ross Winans scientific discoveries seems seventeen-year moving average Simon Kuznets Source stimulus suggests tech technical tend tion total number trend Trough United States Patent value added variable ventions workers Zvi Griliches