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| Registros recuperados: 58 | |
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| Liu, Qinghua; Shumway, C. Richard. |
| The Induced Innovation Hypothesis (IIH) is tested for Western US agriculture by means of a cointegration test. An ECM model is used to separate the short-run and long-run effects of relative price changes. A difference in the elasticities of factor substitution along the isoquant curve and the innovation possibility curve implies IIH. The estimated results showed that the induced innovation hypothesis was supported for the three regions of Washington, PNW, and the West, but not for the nation. However, while changes in relative input prices induced innovation, changes in output level or R&E investments did not. The empirical tests failed to find any significant impact of changes in the latter variables on agricultural technology in any of the... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods. |
| Ano: 2003 |
URL: http://purl.umn.edu/22237 |
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| Ornelas, Fermin S.; Shumway, C. Richard. |
| Supply functions, elasticity estimates, and nonjointness test results consistently indicated that few commodities compete economically in the production of six major Texas vegetables (cabbage, cantaloupes, carrots, onions, potatoes, and watermelons). Significant bias effects caused by government-supported commodities, fixed inputs, and technological change were observed and measured. Nonnested test results for the hypothesis of sequential decision making by vegetable producers were inconclusive, but they gave greater likelihood support to sequential than to contemporaneous decision making. |
| Tipo: Journal Article |
Palavras-chave: Demand and Price Analysis. |
| Ano: 1993 |
URL: http://purl.umn.edu/31640 |
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| Shumway, C. Richard; Liu, Yucan. |
| This paper uses recently developed panel cointegration techniques and error correction modeling to test the hypothesis of induced innovation in a state-level panel of U.S. agricultural production. These methods provide greatly improved power compared to conventional approaches. A 5-step testing procedure is used to test the induced innovation hypothesis based on a 2-stage CES production function with aggregate output and four input categories. For both pairs of inputs, the test fails to support the hypothesis of induced innovation at one or more of the critical steps. |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Research and Development/Tech Change/Emerging Technologies. |
| Ano: 2006 |
URL: http://purl.umn.edu/21089 |
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| Villezca-Becerra, Pedro A.; Shumway, C. Richard. |
| Aggregate dual models are specified to examine multiple-output production relationships in each of four major, geographically dispersed, agricultural states (California, Iowa, Texas, and Florida). Three locally-flexible functional forms (translog, generalized Leontief, and normalized quadratic) are employed to conduct analytic simplification tests, estimate systems of output supply and input demand equations consistent with nonrejected hypotheses, derive elasticities, and determine to what extent analytic simplification tests and policy-relevant results are sensitive to functional form and state. Important differences in empirical implications were found due both to functional form and geographic unit, but differences were greater for the latter. |
| Tipo: Journal Article |
Palavras-chave: Production Economics. |
| Ano: 1992 |
URL: http://purl.umn.edu/30734 |
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| Shumway, C. Richard; Lim, Hongil. |
| Because so much agricultural policy analysis utilizes estimates of supply and demand elasticities, it is crucial to obtain the most reliable estimates possible. Where reliability cannot be adequately assessed, the sensitivity of elasticities to equally plausible a priori specifications should at least be ascertained. In this article, the sensitivity of U.S. output supply and input demand elasticities to choice of functional form. Considerable sensitivity is found to choice of functional form. Although most frequently used, the translog is generally the outlier and is the least preferred among the alternatives. |
| Tipo: Journal Article |
Palavras-chave: Agricultural and Food Policy; Demand and Price Analysis. |
| Ano: 1993 |
URL: http://purl.umn.edu/30959 |
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| Ospina, Enrique; Shumway, C. Richard. |
| Conceptual problems in model specification of beef supply response studies are investigated and a simultaneous equation model is formulated to estimate annual U.S. carcass supply, demand, and inventories of beef. Three basic issues are addressed: (a) disaggregation, (b) simultaneity, and (c) differentiation between current and expected price effects. Empirical results indicate positive supply response of each quality type of steers and heifers, and negative supply response of cows to current own-price changes. The derived aggregate supply elasticity is positive. The effects of grain price changes on beef price, supply and composition are also evaluated. |
| Tipo: Journal Article |
Palavras-chave: Demand and Price Analysis; Livestock Production/Industries. |
| Ano: 1979 |
URL: http://purl.umn.edu/32295 |
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| Williams, Gary W.; Shumway, C. Richard; Love, H. Alan. |
| U.S. soybean producers have been cooperatively investing in both production research and demand promotion for nearly four decades to enhance the profitability and international competitiveness of their industry. Have producers benefitted from their contributions to soybean checkoff program activities over the years? How has the return to investments in soybean production research compared to that of soybean demand promotion investments? The overall positive returns to producers over the study period resulted primarily from promotion activities. Production research contributed negatively to overall producer returns from soybean checkoff investments. |
| Tipo: Journal Article |
Palavras-chave: Agribusiness. |
| Ano: 2002 |
URL: http://purl.umn.edu/31478 |
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| Young, Katherine D.; Shumway, C. Richard. |
| A logistic regression (logit) model was developed to examine how socioeconomic characteristics of cow-calf producers influenced their perceptions of themselves as profit maximizers. Amount of pasture acreage, percent of income earned from the cow-calf operation, and desire to increase net worth and efficiently use labor significantly increased the producer's probability of claiming to be in the business primarily to maximize profits. Some sociological reasons for owning cattle significantly reduced the probability of the producer claiming to be a profit maximizer while others significantly increased the probability. |
| Tipo: Journal Article |
Palavras-chave: Livestock Production/Industries. |
| Ano: 1991 |
URL: http://purl.umn.edu/30294 |
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| Shumway, C. Richard; Davis, George C.. |
| Consistent aggregation ensures that behavioural properties which apply to disaggregate relationships apply also to aggregate relationships. The agricultural economics literature which has tested for consistent aggregation or measured statistical bias and/or inferential errors due to aggregation is reviewed. Tests for aggregation bias and errors of inference are conducted using indices previously tested for consistent aggregation. Failure to reject consistent aggregation in a partition did not entirely mitigate erroneous inference due to aggregation. However, inferential errors due to aggregation were small relative to errors due to incorrect functional form or failure to account for time series properties of data. |
| Tipo: Journal Article |
Palavras-chave: Research Methods/ Statistical Methods. |
| Ano: 2001 |
URL: http://purl.umn.edu/117388 |
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| Polson, Rudolph A.; Shumway, C. Richard. |
| Output supplies and input demands were estimated for each of five South Central states. The model structure in each state was based on prior parametric tests of homothetic separability, and estimates were generally consistent with a competitive, profit-maximizing industry. Considerable diversity among states was evident in selected production relationships. These results further document the non-uniform ways in which producers respond to government farm programs and market information. |
| Tipo: Journal Article |
Palavras-chave: Production Economics. |
| Ano: 1992 |
URL: http://purl.umn.edu/29627 |
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| Lim, Hongil; Shumway, C. Richard; Love, H. Alan. |
| Soybean producers participate in a checkoff program to support research and market development activities. Checkoff funds are used for both yield-enhancing and cost-reducing production research. Using USDA cost-of-production data and a regional modeling framework with greater model pretest support than several alternatives, national marginal returns to producers are estimated to higher for checkoff-supported research than for publicly supported soybean research. They are also higher for checkoff cost reducing than for checkoff yield-enhancing research. |
| Tipo: Journal Article |
Palavras-chave: Agricultural and Food Policy. |
| Ano: 2000 |
URL: http://purl.umn.edu/30836 |
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| Registros recuperados: 58 | |
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