The search for an appropriate methodology to investigate the relation between R&D investment, knowledge stock and productivity growth is the main purpose of the paper. In analogy with physical assets, we present a model of knowledge capital formation which allows the calculation of the relevant...

This paper presents an alternative approach to the measurement of technical change. It is based on the latent variable level of technology that enters explicitly the input demand system and on a hypothesis about the innovation generating process. By adding measurement error equations, the...

Public R&D stock is considered as quasi-fixed input in a variable cost function. Its shadow price allows to measure the long run optimal level thus explicitly assessing the hypothesis of under (over) investment. Two alternative R&D prices are defined depending on whether the social or private...

This paper aims at investigating the price-induced innovation hypothesis in Italian agriculture over the years 1951 to 1991. Price-inducement hypothesis is analysed and tested within the framework proposed by Peeters and Surry (2000). The major difference is the short-run specification of the...

The public R&D capital stock is introduced as a quasi-fixed input in a variable cost function. The relative shadow price allows the correct measurement of the equilibrium levels of quasi-fixed inputs thus explicitly assessing the hypothesis of public R&D under (over) investment. By introducing...

In this paper we aim at investigating the price-induced innovation hypothesis in Italian agriculture. We generalize the framework of analysis proposed by Peeters and Surry (2000). The generalization includes a short-run specification of the dual technology as well as a quadratic spline in a time...

This article deals with the role of public research in Italian agriculture during the period 1960 to 1995. A short-term specification of the GL cost function capable of accommodating quasi-fixed factors and variable returns is employed. Temporary equilibrium and scale economies are investigated...

The search for an appropriate methodology to analyse the relation between R&D investments and the knowledge stock is the main purpose of the paper. The high estimates of internal rates of return on agricultural R&D reported in the literature suggest that there are major empirical problems with...