International R&D spillovers and productivity growth in the agricultural sector. A panel cointegration approach
利用面板协整技术，分析了1970-1992年47个国家的农业国际技术溢出对全要素生产率的影响，发现国内外公共研发支出和地理因素起重要作用，热带国家研发回报率更高。
This paper analyses, within the new growth theory framework and using panel cointegration techniques, the effect of agricultural international technological spillovers on total factor productivity growth for a sample of 47 countries during the period 1970-1992. The analysis shows that total factor productivity is strongly influenced by domestic as well as foreign public R&D spending in agricultural sector and geographical factors matters. Countries located in temperate zones benefit more than countries located in tropical zones from technological spillovers. Finally, the analysis shows that the rate of return to agricultural R&D spending is higher in tropical countries and this could justify new support and an even greater investment of funds for agricultural R&D for these countries.