Observations on technical change and paretian welfare economics

Summary This article brings together two major topics of economic theory: technical change and Paretian welfare economics. Until now, the tendency has been to study these topics separately. By introducing economic search behaviour in the first phase of technical change, the analysis of technical change is broadened by means of a link between this behaviour and so-called virtual goods. The concept of Pareto optimality is broadened by expanding the space of goods with new and virtual goods. The question is whether the generalized Paretian theory makes it possible to compareex post equilibria after the process of technical change with theex post situation before this process takes place. Although generalized Pareto optimality does not allow a welfare judgement on aprocess of technical change, the theory still provides us with an explanation for the allocation of resources of R&D in terms of consumer preferences and with an analytical device to compare actual economic structures with a generalized Pareto optimum in a static setting.If they (i.e. economists) are to perform their guiding task as conscientiously as possible, it is first necessary that they themselves have proper insight into the regrettably narrow limits of what economics has to offer to politics in terms of purely economic criteria; secondly, that they are aware of the foundations and the substance of their additional sociopolitical valuations and finally, that they do not fail to make these known when advising society. (Hennipman, 1995, p. 174).This article is a condensed revised version of my Prof. dr Pieter Hennipman Lecture of February 23, 1993. Some time after the presentation of the lecture, I had the opportunity to discuss several issues with my beloved teacher. No doubt this version benefited from his comments. 1 A notable exception is K.J. Arrow (1962, pp. 210–228).