... radicalUrea synthesis 40 18300F15060 70 80901900⌬ϭ 40 ⌬ϭ 40 ⌬ϭ 40 28 34 39 40 43 46 58650197 84 8077767363595668553225Source: Data from Aftalion (1991), Kaku (1986) and others.Figure ... 13resource-based theory and 3, 32–3search for 157specialization and 13spillovers 44 , 2 24 31tacit 21, 156, 158transactions costs economics and 31, 42 Kondratiev, Nikolai 2 54, 279Kondratiev waves 2 54, ... ‘Technological change and the rate of imitation’,Econometrica, 29 (4) , 741 –66.Mansfield, E. (1963), ‘Intrafirm rates of diffusion of an innovation’, The Review ofEconomics and Statistics, 45 (4) , 348 –59.Mansfield,...