排序方式: 共有19条查询结果,搜索用时 15 毫秒
1.
Specialization,diversification, and productivity: a panel data analysis of rice farms in Korea 总被引:1,自引:0,他引:1
Kwansoo Kim Jean‐Paul Chavas Bradford Barham Jeremy Foltz 《Agricultural Economics》2012,43(6):687-700
This article examines the microeconomics of productivity associated with specialization/diversification in production activities, with an application to Korean rice farms. Korean rice farms tend to be very small and highly specialized. Our analysis examines the productivity effects associated with both farm size and farm specialization/diversification in Korean agriculture. Relying on farm‐level panel data, the analysis studies farm productivity in a multi‐input multi‐output context, accounting not only for changes in inputs and technical change in rice production, but also for the role of diversification in the production of other crops in current and previous periods. We find positive but small productivity gains from farm diversification. These gains come mostly from complementarity effects across farm outputs, with minimal effect of scale economies. The positive complementarity effects work against nonconvexity effects, which provide strong productivity incentives for rice farms to specialize. 相似文献
2.
The current article explores the characteristics that distinguish early from late adopters of GM corn and measures the productivity impacts of early adoption, for a sample of farmers in Minnesota and Wisconsin. The results of the adoption analysis confirm that size, education as well as specialization are positively correlated with early adoption. In addition, these results also show that farms that are mostly worked by family labor but hire some off‐farm labor are more likely to adopt GM seeds earlier in the diffusion process. The productivity analysis demonstrates the superiority of stacked varieties. At the same time, we find no evidence of a direct impact of experience on yields. Given the previously documented impact of early adoption on the use of stacked varieties, we conclude that experience plays a role through the adoption of these new technologies but does not play a role in allowing the producer to use the technology more efficiently, once it has been adopted. 相似文献
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Jeremy D. Foltz Bradford L. Barham Jean-Paul Chavas Kwansoo Kim 《Journal of Productivity Analysis》2012,37(2):171-186
This article investigates the determinants of efficiency and technological progress at US research universities. It relies
on a unique panel data set of multiple outputs and inputs from 92 universities covering the period 1981–1998. Over that time
span, US universities experienced large increases in industry funding and in academic patenting activity. In this context,
the directional distance function and a nonparametric representation of the underlying production technology are combined
to obtain estimates of productivity growth and technical efficiency. An econometric analysis is then presented to examine
the determinants of technical efficiency and the rate of technological progress. The results show how changes in funding sources
for US research universities affects research performance. 相似文献
5.
This study aims to examine the extent to which certain characteristics and asset endowments of smallholder farmer groups facilitate collective action initiatives to improve group marketing performance. This is approached through an evaluation of a government-led programme in Tanzania, which is attempting to increase smallholder farmers’ incomes and food security through a market-oriented intervention. Findings suggest that more mature groups with strong internal institutions, functioning group activities, and a good asset base of natural capital are more likely to improve their market situation. Gender composition of groups also affects group marketing performance, as an enabling factor for male-dominated groups. Structural social capital in the form of membership in other groups and ties to external service providers, and cognitive social capital in the form of intra-group trust and altruistic behaviour are not significant factors in a group’s ability to improve its market situation. 相似文献
6.
Jeremy D. Foltz Kwansoo Kim Bradford Barham 《American journal of agricultural economics》2003,85(1):187-197
This article examines the factors that account for agricultural biotechnology patenting success among universities using a dynamic count data model. It builds a theoretical and econometric model to capture the inherently dynamic and nonlinear process of technological innovation, wherein a feedback mechanism from previous success partially determines current patent counts. The econometric estimates reveal the importance to agricultural biotechnology patent production of land grant infrastructure, quality faculty, patent-oriented technology transfer offices, as well as dynamic feedback effects. 相似文献
7.
This work exploits information on U.S. patents to identify trends in university ag-biotech patenting and citation performance. It sets forth some key issues concerning patterns of university ag-biotech patenting and then provides an empirical analysis of the evolving trends. Land grant universities account for most U.S. ag-biotech patents. The data show a path-dependent innovation pattern, in which there also seems to be a culture of patenting that develops at certain universities. Evidence shows that ag-biotech patents are more cited than the average university patent. Inequalities across land grant universities are also evident in the production of ag-biotech patents, although perhaps not to a much greater degree than underlying inequalities in funding and research qualities. The paper closes by considering how the evidence offered might be used to advance the public discussion regarding trends in agricultural biotechnology research in the United States. 相似文献
8.
Yoshito Takasaki Bradford L. Barham Oliver T. Coomes 《Review of Development Economics》2010,14(1):48-63
This article examines the role of ex post labor supply in smoothing income in response to crop losses caused by large floods among riverine households in the Peruvian Amazon, where rich environmental endowments permit a variety of resource extractive activities and coping responses. The paper finds that households respond to crop losses primarily by intensifying fishing effort, not by relying on gathering of nontimber forest products, hunting, or asset liquidation. This ex post labor adjustment helps to smooth total income against small crop losses but less well against large crop losses. Both relatively nonpoor households with better fishing capital and poor young households with a physical labor advantage employ this natural insurance in rivers. 相似文献
9.
Pilar Useche Bradford L. Barham Jeremy D. Foltz 《American journal of agricultural economics》2009,91(2):444-461
This article proposes a model of technology adoption that integrates demand for individual traits of new technologies with the potential for heterogeneity based on farm and farmer characteristics. The model is applied to recent genetically modified corn adoption data from Minnesota and Wisconsin farmers, using a mixed-multinomial logit (MMNL) model to estimate the effects of traits and farm and farmer characteristics on adoption outcomes. This approach allows explicit recovery of estimates of farmers' shadow prices for individual technology traits. Results show the importance of producer and regional heterogeneity in preferences for seed traits. 相似文献
10.
Bradford L. Barham Jeremy D. Foltz Sunung Moon Douglas Jackson-Smith 《Review of Agricultural Economics》2004,26(1):32-44
Trends and determinants in the adoption of recombinant bovine somatotropin are examined using data from across the United States. The core findings are: ( a ) moderate adoption rates and relatively small impacts on national milk production; ( b ) substantial disadoption, farmers who have tried the technology but stopped using it; ( c ) no significant differences in characteristics between adopters and disadopters; and ( d ) major differences between nonadopters and farmers who have tried the technology, with the latter group having significantly higher use rates of complementary, productivity-enhancing technologies and larger herd sizes. This last result holds across states with distinctive herd size distributions. 相似文献