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| Registros recuperados: 58 | |
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| McIntosh, Christopher S.; Shumway, C. Richard. |
| A restricted profit function model of California agriculture is specified and estimated subject to prior information provided by economic theory. Symmetry, homogeneity, and convexity of the profit function are maintained in the estimation. Parameter estimates and elasticities are presented for four input and 10 output equations. Tests of the hypotheses of nonjointness in inputs and Hicks-neutral technical change in variable inputs and outputs are rejected. The impacts of decoupling agricultural program payments are examined. |
| Tipo: Journal Article |
Palavras-chave: Agricultural Finance. |
| Ano: 1991 |
URL: http://purl.umn.edu/32610 |
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| Polson, Rudolph A.; Shumway, C. Richard. |
| Using a dual economic specification of a multiproduct technology, the structure of agricultural production was tested for five South Central states (Texas, Oklahoma, Arkansas, Mississippi, and Louisiana). A comprehensive set of output supplies and input demands comprised the estimation equations in each state. Evidence of nonjoint production in a subset of commodities was detected in four of the five states. Several commodities also satisfied sufficient conditions for consistent aggregations. However, the specific outputs satisfying each structural property varied by state. Sufficient conditions for consistent geographic aggregation across the states were not satisfied. These results provide empirical guidance and important cautions for legitimately... |
| Tipo: Journal Article |
Palavras-chave: Industrial Organization. |
| Ano: 1990 |
URL: http://purl.umn.edu/30008 |
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| Shumway, C. Richard; Chesser, Rayanne R.. |
| The impact of an ad valorem pesticide tax on cropping patterns and pesticide use was examined in the South Central Texas Crop Reporting District. Output supply equations were econometrically estimated and used in the simulation. A 25 percent tax on pesticide was estimated to have major impacts on cropping patterns and on pesticide use. Assuming other input and output prices were unaffected, the supply of one important crop would fall by more than half. Demand for some of the highly soluble and persistent pesticides, which present the greatest threat to groundwater quality, would also decrease substantially (some as much as 50 percent). |
| Tipo: Journal Article |
Palavras-chave: Crops; Dual model; Pesticides; Water quality; Supply; Crop Production/Industries. |
| Ano: 1994 |
URL: http://purl.umn.edu/15433 |
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| Blake, Robert W.; Shumway, C. Richard; Tomaszewski, Michael A.; Rickard, Greg P.; Labore, John M.. |
| The Net Present Value Sire Summary Professional Package (NPVSS) is a microcomputer program designed for technical personnel to help dairy producers better manage investments in genetic improvement. NPVSS is written in C language, utilizes the MS-DOS operating system, and requires 256K of RAM. It is menu driven and includes parameter screens to define herd management characteristics of individual producers. Profit rankings of bulls can be generated to evaluate alternative: a) objective functions (selection policies for genetic merit in milk income and type scores), b) herd management performance factors (conception rate, calving interval, age at first calving), and c) economic factors (milk price, semen price, discount rate, planning horizon). |
| Tipo: Journal Article |
Palavras-chave: Livestock Production/Industries. |
| Ano: 1988 |
URL: http://purl.umn.edu/29708 |
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| Shumway, C. Richard; Jegasothy, Kandiah; Alexander, William P.. |
| Technical change and the extent to which commodity supplies and input demands are interrelated in Sri Lankan peasant agriculture are explored in this paper. Using a multiple-product dual model, a seemingly unrelated system of product supply and input demand equations is estimated for four crops and four variable inputs. Restrictions based on competitive behaviour and a twice continuously-differentiable production function are maintained in the non-linear least squares estimation. A number of important interrelationships in individual product supplies and input demands are identified, further documenting the need to account for intercommodity production relationships in econometric and simulation studies and in policy formulation. Non-joint production and... |
| Tipo: Journal Article |
Palavras-chave: Productivity Analysis; Research Methods/ Statistical Methods. |
| Ano: 1988 |
URL: http://purl.umn.edu/22575 |
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| Benson, Aaron; Shumway, C. Richard. |
| In a seeming paradox, bluegrass seed production in the State of Washington increased following imposition of a statewide ban on stubble burning in 1996. Despite forecasts that alternative production practices would increase the cost of producing bluegrass seed so much that the industry would be driven from the state, production in the years 1997-2003 was higher than in any seven-year period in recorded history. This study seeks to explain why this occurred. Several hypotheses are put forward and systematically tested. The final hypothesis, induced innovation, cannot be formally tested because of data limitations, but it is examined by an assessment of innovations that occurred contemporaneously with the ban and by corroborative statistical evidence.... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Environmental Economics and Policy. |
| Ano: 2005 |
URL: http://purl.umn.edu/19450 |
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| Lin, Ni; Shumway, C. Richard. |
| The sensitivity of asset fixity conclusions, input adjustment rates, and elasticities to choice of functional form is examined using a dynamic dual model of U.S. agriculture. A very general initial specification allows tests of instantaneous adjustment to be performed for every input. Test results are mixed across functional forms for all inputs except real estate, which is consistently found to be quasi-fixed. Important differences in estimated adjustment rates and elasticities are also found among the functional forms. The translog has higher likelihood support than either the generalized Leontief or normalized quadratic functional forms for this dynamic model specification and data set. |
| Tipo: Working or Discussion Paper |
Palavras-chave: Agricultural Finance; Research Methods/ Statistical Methods; Q11; C51. |
| Ano: 2000 |
URL: http://purl.umn.edu/12967 |
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| Liu, Qinghua; Shumway, C. Richard. |
| Consistent aggregation of production data across commodities and Western USA states was tested using Lewbel's generalised composite commodity theorem. The applicability of the generalised composite commodity theorem for testing consistent geographic aggregation was demonstrated and applied to two groups of states. Consistent commodity aggregation was tested in each state for two output groups and three input groups and in one state for a larger number of groups. Most tests for commodity aggregation supported consistent aggregation of inputs but not outputs. Consistent geographic aggregation was supported for each output and input category across Pacific Northwest states but only for inputs across all Western states. |
| Tipo: Journal Article |
Palavras-chave: Farm Management. |
| Ano: 2004 |
URL: http://purl.umn.edu/117974 |
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| Shumway, C. Richard. |
| This essay is a critique of research evaluation research. Considerable evidence exists that agricultural research conducted during the era when projects were chosen by diffuse selection systems yielded extraordinarily high returns. It is not obvious that the formalized, quantitative, and typically centralized selection models can be expected to produce higher contemporary returns than the decentralized informal mechanisms. All ex ante evaluations are intrinsically subjective, regardless of technique used to generate the evaluation. The extreme uncertainty surrounding the nonrepetitive new-knowledge production function further limits the potential of the sophisticated selection procedures. Perhaps of greatest importance, however, are the high costs imposed... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Research and Development/Tech Change/Emerging Technologies. |
| Ano: 1981 |
URL: http://purl.umn.edu/49058 |
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| Howard, Wayne H.; Shumway, C. Richard. |
| The robustness of dynamic dual model results across functional forms is examined for the U.S. dairy industry. Modified generalized Leontief (GL) and normalized quadratic (NQ) functional forms are compared by examining their consistency with properties of the competitive firm, estimated rates of adjustment for cows and labor, tests of technological change, and elasticities. Homogeneity and symmetry are maintained in both models. Convexity is not rejected by the GL and is not seriously violated by the NQ. Absence of technological change is rejected by both models, but quality indexes on labor and cows fully embody technological change occurring within labor and cows in the NQ but not in the GL. Policy-relevant elasticities differ greatly between the... |
| Tipo: Journal Article |
Palavras-chave: Livestock Production/Industries. |
| Ano: 1989 |
URL: http://purl.umn.edu/28808 |
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| Liu, Yucan; Shumway, C. Richard. |
| The curvature properties of the indirect utility function imply a set of refutable implications in the form of comparative static results and symmetric relations for the competitive firm operating under uncertainty. These hypotheses, first derived and empirically tested under output price uncertainty by Saha and Shumway (1998), are extended in this article to the more general case of both price and quantity uncertainty and result in an important theoretical finding. Using recently developed techniques for testing unit root and cointegration in heterogeneous panels, we develop a model of U.S. agricultural production based on the time series properties of a panel of state-level data and contrast test implications with those resulting from a traditional model... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Risk and Uncertainty. |
| Ano: 2005 |
URL: http://purl.umn.edu/36307 |
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| Shumway, C. Richard; Davis, George C.. |
| Consistent aggregation assures that behavioral properties, which apply to disaggregate relationships also, apply to aggregate relationships. The agricultural economics literature is reviewed which has tested for consistent aggregation or measured statistical bias and/or inferential errors due to aggregation. 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: Working or Discussion Paper |
Palavras-chave: Research Methods/ Statistical Methods. |
| Ano: 2000 |
URL: http://purl.umn.edu/12966 |
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| Registros recuperados: 58 | |
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