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1.
This paper briefly presents the results of a total factor productivity (TFP) study of South African commercial agriculture, for 1947‐1997, and illustrates some potential pitfalls in rate of return to research (ROR) calculations. The lag between R&D and TFP is analyzed and found to be only 9 years, with a pronounced negative skew, reflecting the adaptive focus of the South African system. The two‐stage approach gives a massive ROR of 170%. The predetermined lag parameters are then used in modeling the knowledge stock, to refine the estimates of the ROR from short‐ and long‐run dual profit functions. In the short run, with the capital inputs treated as fixed, the ROR is a more reasonable 44%. In the long run, with adjustment of the capital stocks, it rises to 113%, which would reflect the fact that new technology is embodied in the capital items. However, the long‐run model raises a new problem since capital stock adjustment takes 11 years, 2 years longer than the lag between R&D and TFP. If this is assumed to be the correct lag, the ROR falls to 58%, a best estimate. The paper draws attention to the possible sensitivity of rate of return calculations to assumed lag structure, particularly when the lag between changes in R&D and TFP is skewed.  相似文献   

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We analyse European agri‐food firms’ choices about innovation in‐house or through outsourcing and provide empirical evidence about the correlation between these strategies. The relationship between the innovation strategy and firm‐, industry‐ and innovation‐specific characteristics is analysed through a bivariate probit model, which uses firm data from the EFIGE Bruegel‐UniCredit dataset. Transaction cost, resource base and knowledge governance arguments are used to explain the choice of innovation strategy. Our results show that the decisions to innovate in‐house or through outsourcing are independent from each other. In addition, we find that several organisational characteristics such as communication systems, human resource practices and specialisation are likely to influence both strategies. Conversely, organisational characteristics such as the allocation of authority and the business network do not seem relevant in determining the innovation strategies of the European agri‐food sector.  相似文献   

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Effective agricultural extension is key to improving productivity, increasing farmers’ access to information, and promoting more diverse sets of crops and improved methods of cultivation. In India, however, the coverage of agricultural extension workers and the relevance of extension advice is poor. We investigate whether a women's self‐help group (SHG) platform could be an effective way of improving access to information, women's empowerment in agriculture, agricultural practices, and production diversity. We use cross‐sectional data on close to 1,000 women from five states in India and employ nearest‐neighbor matching models to match SHG and non‐SHG women along a range of observed characteristics. We find that participation in an SHG increases women's access to information and their participation in some agricultural decisions, but has limited impact on agricultural practices or outcomes, possibly due to financial constraints, social norms, and women's domestic responsibilities. SHGs need to go beyond provision of information to changing the dynamics around women's participation in agriculture to effectively translate knowledge into practice.  相似文献   

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New Communities are again being promoted as an alternative to sprawling urban growth. This paper uses the results of a unique survey of the real estate development communities in the U.S. and U.K. to examine the likelihood that future New Communities will provide the array of amenities necessary to create developments that provide a true alternative to sprawl. Based on an analysis of this data we conclude that while developers do envision New Communities as more amenity rich than much of the suburban master-planned communities of the last few decades, they are nonetheless still likely to produce developments that have an insufficient array of amenities to make future New Communities a strong alternative to sprawl.  相似文献   

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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.  相似文献   

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The view of the commons as archaic, ‘backward’ and ‘irrational’ institutions for the management of resources has now been revised in favour of a more positive one, for both past and present societies. Indeed, it is clear that the commons had multifarious ecological and economic benefits for both medieval and early modern rural societies in Western Europe. That being the case, many scholars have seen the increasing expropriation of the commons in the transition to the early modern period as a sign of increasing inequality characterizing pre‐industrial Europe, and many have lamented the loss of communal grazing privileges connected to processes such as land enclosure – pushing poor peasants into the ‘abyss’ with the removal of their final form of welfare. However, in this paper it is argued that the social distribution of the benefits to the commons were rarely, if ever, entirely equitable. In fact, in many historical contexts the benefits of the commons could also be highly restricted – crystallizing and entrenching stratifications themselves, and even serving as the ‘vehicle’ of further inequality. The expropriation of the commons did not necessarily make Western European rural societies any more unequal.  相似文献   

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