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Research paper : Modeling the social acceptance of industrial technologies (M. Matsumoto et al.)−34−Synthesiology - English edition Vol.2 No.1 (2009) difficulties are.Answer (Mitsutaka Matsumoto)Verification is a problem. We attempted statistically extracting product price and changes in diffusion rate using diffusion transition of past product and price change data obtained from price statistics, but failed to obtain statistically significant results. In the point of parameter sensitivity, we worked on seeking influences on product diffusion of shifts in product price, running cost (electricity or gasoline costs), improved environmental performance, and environmental consciousness. Relative sensitivity basically is dependent on the result of conjoint analysis. As result of conducting sensitivity analysis in expected range of change, we obtained result that improvement of environmental performance was effective in promoting diffusion. In terms of absolute sensitivity, our model may be dull in sensitivity. The result (Fig. 9) shows that there isn’t much change in diffusions in different scenarios. For the other method that you indicated, consideration of the policy in California is very interesting. Currently, we are conducting survey of policy assessments. As verification material, since the amounts of subsidy differ by local governments for home-use solar power generation system, we can see the relationship between subsidy and diffusion. Powerful diffusion promotion has been conducted for the electronic toll collection (ETC) system for vehicles, though not an eco-product, through discount on expressway costs. It is an interesting case in observing the effect of diffusion promotion policy. Verification is an issue that we are currently working from various perspectives.

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