International Transmission of Technology and Trade: The Role of Cross-country Heterogeneity

In the framework where the channel of international transmission of technology is trade in intermediate inputs, this paper investigates the role of heterogeneities across countries. In particular, this paper analyzes how cross-country differences in production structure, national innovative capacity, and absorptive capacity affect the scope and magnitude of international R&D spillovers on productivity. The study is based on the industry-level data set that covers eight OECD countries from 1970 to 1995. It finds that accounting for cross-country differences in each of production structure (using country-specific input–output relations) and national innovative capacity (using patents granted per R&D investment) yields significantly different spillover effects than previous studies. This suggests that the effect of international R&D spillovers depends on both production structure and the pattern of international trade. Further, it finds the absorptive capacity of a country is positively related to spillovers.     

城市导视系统设计

城市导视系统设计是指一个完整的城市指示系统,包括行政交通导视系统、商业导视系统、文化旅游导视系统等.城市导视系统系统是城市形象和城市功能的重要组成部分,其合理设计和运用不仅可以使城市生活更加便利,而且也是使城市具有魅力的形象塑造.本文对国内国际上的优秀案例进行分析,并就城市导视系统设计的功能、审美特征以及实施方法进行了探讨.     

A model of the U.S. food system: What are the determinants of the state vulnerabilities to production shocks and supply chain disruptions?

We adapt a Ricardian general equilibrium model to the setting of U.S. domestic agri-food trade to assess states’ vulnerability to adverse production shocks and supply chain disruptions. To this end, we analyze how domestic crop supply chains depend on fundamental state-level comparative advantages—which reflect underlying differences in states’ cost-adjusted productivity levels—and thereby illustrate the capacity of states to adapt to and mitigate the impacts of such disruptions to the U.S. agricultural sector. Based on the theoretical framework and our estimates of the model's structural parameters obtained using data on U.S. production, consumption, and domestic trade in crops, we undertake simulations to characterize the welfare implications of counterfactual scenarios depicting disruptions to (1) states’ agricultural productive capacity, and (2) interstate supply linkages. Our results emphasize that the distributional impacts of domestic supply chain disruptions hinge on individual states’ agricultural productive capacities, and that the ability of states to mitigate the impacts of adverse production shocks through trade relies on the degree to which states are able to substitute local production shortfalls by sourcing crops from other states.