Key points are not available for this paper at this time.
I. Introduction, 600. — II. Utility-effort relations, 601. — III. The theory of inert areas, 606. — IV. Inert areas and the inducement of change, 612. — V. The innovational-diffusion model, 617. — VI. Conclusions, 620.
Harvey Leibenstein (Sat,) studied this question.