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| Registros recuperados: 20 | |
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| Evenson, Robert E.. |
| Genetically Modified Crops (GMO foods) have been widely available to farmers since 1996. The Gene Revolution, based on recombinant DNA (rDNA) genetic engineering techniques, is seen by proponents as both supplanting Green Revolution varieties, based on conventional plant breeding techniques, and potentially enabling disadvantaged production environments, unreached by Green Revolution varieties to achieve productivity improvements. This paper argues that the private firms supplying GM crop products have generally had little interest in selling products in disadvantaged production environments. The paper also argues that present rDNA techniques allow only static gains from specific trait improvements. But these GM products can be installed on Green... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Genetically modified foods; Genetic engineering; Crop Production/Industries; O1; O4; Q1. |
| Ano: 2003 |
URL: http://purl.umn.edu/28504 |
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| Evenson, Robert E.; Rosegrant, Mark W.; Msangi, Siwa; Sulser, Timothy B.. |
| In this paper, we conduct two "counterfactual" simulations for the 30-year period 1970-2000-the first holding 1970 crop genetic improvements (CGI) constant and the second presuming the International Agricultural Research Center (IARC) system had not been built. Both these counterfactuals apply to developing countries only. The core estimates on which the counterfactuals are based include country fixed effects , and the key estimates are for the Dietary Energy Sufficiency (DES) equation. DES affects birth rates, death rates, child mortality rates and malnutrition rates, making it possible to "endogenize" population growth in developing countries, in the counterfactuals. Reduced DES levels (from reduced CGI contributions) will lead to more births, more... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Research and Development/Tech Change/Emerging Technologies. |
| Ano: 2006 |
URL: http://purl.umn.edu/21363 |
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| Evenson, Robert E.; Huffman, Wallace E.. |
| This paper presents (1) a conceptual framework for structural change when farms may be multiproduct or specialized and (2) an econometrics examination of causes of structural and total factor productivity (TFP) change for U.S. agriculture. Farm size, farm specialization, and part-time farming are the structural dimension emphasized, and they become potential channels to TFP change. Using state aggregate data starting in 1950, we conclude that input prices, public and private research, public extension, and government commodity programs have directly and indirectly caused change in U.S. farm structure and TFP. Our results suggest that changes in farm size, however, have been dominated by input price changes rather than by technology or government programs. |
| Tipo: Working or Discussion Paper |
Palavras-chave: Farm structure; Productivity; Farm size; Farm specialization; Part-time farming; Research; Technical change; Agriculture; Industrial Organization. |
| Ano: 1997 |
URL: http://purl.umn.edu/28518 |
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| Huffman, Wallace E.; Evenson, Robert E.. |
| This paper examines the impact of public and private agricultural research and extension on agricultural total factor productivity at the state level. We test the hypothesis that the composition of agricultural experiment station funding share of funding from impact of federal competitive grants and contracts and from federal formula and state government appropriations---affects the productivity of public agricultural research using data for the 48 contiguous states over 1970-1999. Our results show not only that sources of funding matter, but that an increase in federal competitive grant funding at the expense of federal formula funding would lower the productivity of public agricultural research. Furthermore, our simulation results show that a few states... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Productivity Analysis; Research and Development/Tech Change/Emerging Technologies. |
| Ano: 2003 |
URL: http://purl.umn.edu/18201 |
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| Evenson, Robert E.; Kimhi, Ayal; Desilva, Sanjaya. |
| Labor markets in all economies are subject to transaction costs associated with recruiting, monitoring and supervising workers. Rural labor markets in developing economies, where institutions such as labor and contract law and formal employment assistance mechanisms are not in place, are regarded to be particularly sensitive to transaction cost conditions. The inherent difficulty of measuring transaction costs has limited studies on this topic. In this paper, we analyze supervision activities reported in a cross-section survey of rice farmers in the Bicol region of the Philippines. This survey is unique because it provides supervision data at the farm task level. We present a simple optimization model in which supervision intensity increases the... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Transaction costs; Supervision; Labor markets; Philippines; Crop Production/Industries; 013; D23; J43; Q12. |
| Ano: 2000 |
URL: http://purl.umn.edu/28467 |
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| Evenson, Robert E.; Kimhi, Ayal; Desilva, Sanjaya. |
| Labor markets in all economies are subject to transaction costs associated with recruiting, monitoring and supervising workers. The level of transaction costs affects labor and land contract choices and family labor advantages. Rural labor markets in developing economies, where institutions such as labor and contract law and formal employment assistance mechanisms are not in place, are regarded to be particularly sensitive to transaction cost conditions. A number of studies of contract choice support this contention. The inherent difficulty of measuring transaction costs, however, has limited studies on this topic. In this paper, we analyze supervision activities reported in a cross-section survey of rice farmers in the Bicol region of the Philippines.... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Crop Production/Industries. |
| Ano: 2000 |
URL: http://purl.umn.edu/21788 |
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| McKinsey, James W., Jr.; Evenson, Robert E.. |
| This paper presents a model of the Green Revolution in India, in which the development and diffusion of HYVs, the expansion of irrigation and the expansion of multiple-cropping are treated as endogenous responses to more basic investments in agricultural technology and infrastructure, as well as to climate and edaphic endowments. We incorporate explicit climate-technology interactions in the model, in order to identify climate effects on the diffusion of HYVs, irrigation and multiple-cropping, and on Net Revenue to agriculture. We find that climate affects technology development and diffusion, and that technology development and diffusion affect the impacts of climate on agricultural productivity in India. |
| Tipo: Working or Discussion Paper |
Palavras-chave: Green Revolution; India; HYV; Rice; Wheat; Climate; Agricultural research; International Development; 112; 121; 226; 620; 710. |
| Ano: 1999 |
URL: http://purl.umn.edu/28452 |
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| Evenson, Robert E.; Mwabu, Germano. |
| The paper examines effects of agricultural extension on crop yields in Kenya controlling for other determinants of yields, notably the schooling of farmers and agro-ecological characteristics of arable land. The data we use were collected by the Government of Kenya in 1982 and 1990, but the estimation results reported in the paper are based primarily on the 1982 data set. The sample used for estimation contains information about crop production, agricultural extension workers (exogenously supplied to farms), educational attainment of farmers, usage of farm inputs, among others. A quantile regression technique was used to investigate productivity effects of agricultural extension and other farm inputs over the entire conditional distribution of farm yield... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Agricultural extension; Economic effects; Q16; Teaching/Communication/Extension/Profession; O13. |
| Ano: 1998 |
URL: http://purl.umn.edu/28509 |
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| Lanzona, Leonardo; Evenson, Robert E.. |
| The paper aims to measure transaction costs and its effects on labor market participation and on wage earnings. The observed differences between buying and selling prices of rice across households are used to calculate transaction costs indices for villages which are incorporated into the standard labor market participation and Mincer wage equations. The estimates indicate that transaction costs may be a source of the income differentials between (a) the landed and the landless, (b) the rural and the urban areas, and (c) the males and the females. Furthermore, biases can be noted in the regression coefficients of estimates that do not control for transaction costs. |
| Tipo: Working or Discussion Paper |
Palavras-chave: Transaction costs; Labor market participation; Philippines; Labor and Human Capital. |
| Ano: 1997 |
URL: http://purl.umn.edu/28465 |
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| Rosegrant, Mark W.; Evenson, Robert E.. |
| This paper assesses total factor productivity (TFP) growth in India, examines the sources of productivity growth, including public and private investment, and estimates the rates of return to public investments in agriculture. The results show that significant TFP growth in the Indian crops sector was produced by investments -- primarily in research -- but also in extension, markets, and irrigation. The high rates of return, particularly to public agricultural research and extension, indicate that the Government of India is not over investing in agricultural research and investment, but rather that current levels of public investment could be profitably expanded. |
| Tipo: Working or Discussion Paper |
Palavras-chave: International Development. |
| Ano: 1995 |
URL: http://purl.umn.edu/42821 |
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| Registros recuperados: 20 | |
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