International , intersectoral or both ? In search for the nature of R & D Spillovers ∗
نویسندگان
چکیده
The aim of this paper is to identify the nature of R&D spillovers from an intersectoral, international as well as combined international-intersectoral perspective. We use panel data for sub-sectors of the manufacturing industry among 13 OECD countries in the period 1988 to 2006. We estimate Griliches-type knowledge production functions at the aggregate level along with two-digit industry level, where R&D investments outside the own industry enter as an explicit regressor. The endogenous variable of interest is labour productivity growth. In order to properly weight the R&D induced spillover effects, we construct different weighting schemes based on the technological and trade-based connectivity between sectors and countries respectively, as well as a combination of the two modes. Although we do not use spatial data as such, we estimate the sectoral production function models by means of spatial econometrics, which allows for a consistent treatment of weighted variables derived from the endogenous regressand as well as the set of explanatory regressors. The empirical estimate indicates that both international and domestic R&D knowledge spillovers matter for explaining the productivity growth. Spillovers from other sector is more than the spillover from same sector domestic and foreing R&D expenditures. JEL Codes: O11, O33, O47, C23
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تاریخ انتشار 2013