Introduction to "The Rate and Direction of Inventive Activity: Economic and Social Factors"

Richard Nelson, The Rate and Direction of Inventive Activity: Economic and Social Factors (Princeton University Press, 1962), https://www.nber.org/books-and-chapters/rate-and-direction-inventive-activity-economic-and-social-factors/introduction-rate-and-direction-inventive-activity-economic-and-social-factors.