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Registros recuperados: 58
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A CRITIQUE OF THE CONSTANT ELASTICITY OF TRANSFORMATION (CET) LINEAR SUPPLY SYSTEM AgEcon
Shumway, C. Richard; Powell, Alan A..
An elusive restriction maintained in earlier CET supply models with three or more products is shown to result in a potentially serious misspecification. Its impact on empirical estimates is found to be substantial, and an alternative formulation is presented which overcomes the problem while still maintaining the CET hypothesis.
Tipo: Journal Article Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1984 URL: http://purl.umn.edu/32129
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A POOLED TIME-SERIES CROSS-SECTION ANALYSIS OF LAND PRICES AgEcon
Chavas, Jean-Paul; Shumway, C. Richard.
Based on a theoretical formulation of land price formation as an economic rent to a fixed input, a single equation econometric model is specified and estimated to explain land prices in five Iowa crop reporting districts. It identifies the influence of farm prices, inflationary pressures, and land quality on the price of land.
Tipo: Journal Article Palavras-chave: Land Economics/Use.
Ano: 1982 URL: http://purl.umn.edu/32424
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ADAPTIVE PLANNING OVER THE CATTLE PRICE CYCLE AgEcon
Bentley, Ernest; Shumway, C. Richard.
Tipo: Journal Article Palavras-chave: Demand and Price Analysis.
Ano: 1981 URL: http://purl.umn.edu/30083
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AGGREGATION WITHOUT SEPARABILITY: TESTS OF U.S. AND MEXICAN AGRICULTURAL PRODUCTION DATA AgEcon
Lin, Ni; Davis, George C.; Shumway, C. Richard.
The generalized composite commodity theorem (Lewbel 1996) is used to test for consistent aggregation of U.S. and Mexican agricultural production data in each of the categories for which earlier tests rejected homothetic separability. All U.S. agricultural outputs can be justifiably aggregated into as few as four categories. All Mexican agricultural outputs can be aggregated into as few as five categories. The aggregation of all outputs into a single output cannot be supported in either country by sufficient conditions provided by the generalized composite commodity theorem and/or a homothetically separable technology.
Tipo: Conference Paper or Presentation Palavras-chave: Aggregation; Separability; Generalized composite commodity theorem; Demand and Price Analysis.
Ano: 1998 URL: http://purl.umn.edu/20927
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ALLOCATABLE FIXED INPUTS AND JOINTNESS IN AGRICULTURAL PRODUCTION: MORE IMPLICATIONS AgEcon
Asunka, Samuel; Shumway, C. Richard.
The presence of allocatable fixed inputs may cause truly joint technologies to appear nonjoint in the short run as well as truly nonjoint technologies to appear joint. This paper demonstrates theoretically why this can happen and then documents that it actually occurs in a significant way in aggregate U.S. agricultural production. A simple testing procedure is used that requires no data on inputs allocations. The important finding is that failure to reject true (apparent) nonjointness does not justify modeling short-run (long-run) supply independent of alternative output prices.
Tipo: Journal Article Palavras-chave: Agribusiness.
Ano: 1996 URL: http://purl.umn.edu/31397
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ANALYSIS OF INNOVATIONS: DAIRY AND EXOTIC CROSSBREEDS FOR BEEF PRODUCTION AgEcon
Shumway, C. Richard; Bentley, Ernest.
Tipo: Journal Article Palavras-chave: Livestock Production/Industries.
Ano: 1974 URL: http://purl.umn.edu/29813
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ASSET FIXITY IN U.S. AGRICULTURE: ROBUSTNESS TO FUNCTIONAL FORM AgEcon
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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Benefits of Reducing Nutrient Variation in Fertilizer Mixes AgEcon
Chamberlain, Peter J.; Shumway, C. Richard.
This article examines nutrient deficiencies (below guaranteed levels) in major blended commercial fertilizers and their economic impact on net revenues of Texas farmers. Violations by fertilizer manufactures in meeting specific labeled nutrient levels were more than offset in economic value by excesses in other nutrients and by production of blends that contained more than the required levels of all nutrients. The study concluded that economic losses to Texas farmers would likely be associated with requiring nutrient levels to be more tightly distributed around the guaranteed or labeled nutrient levels.
Tipo: Journal Article Palavras-chave: Benefits; Distribution; Fertilizer; Nutrient deficiencies; Agribusiness; Production Economics.
Ano: 1994 URL: http://purl.umn.edu/62353
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COW-CALF PRODUCERS' PERCEIVED PROFIT MAXIMIZATION OBJECTIVE: A LOGIT ANALYSIS AgEcon
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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Demand and Supply of Induced Innovation: An Application to U.S. Agriculture AgEcon
Liu, Yucan; Shumway, C. Richard.
The hypothesis of induced innovation (Hicks, 1932) is tested for U.S. agriculture using a high-quality state-level panel data set and three disparate testing techniques ¨C time series, econometric, and nonparametric. The conclusion of little support for the hypothesis is robust across testing techniques. However, each test maintains the hypothesis that the relative marginal cost of developing and implementing technologies that save one input is the same as for any other input. Lacking data on development and implementation costs of input-saving technologies, we use nonparametric procedures to estimate relative differences required for technological change to be consistent with the induced innovation hypothesis.
Tipo: Conference Paper or Presentation Palavras-chave: Research and Development/Tech Change/Emerging Technologies.
Ano: 2007 URL: http://purl.umn.edu/9844
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DERIVED DEMAND FOR IRRIGATION WATER: THE CALIFORNIA AQUEDUCT AgEcon
Shumway, C. Richard.
Tipo: Journal Article Palavras-chave: Resource /Energy Economics and Policy.
Ano: 1973 URL: http://purl.umn.edu/29439
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DETERMINING OPTIMAL REPLACEMENT AGE OF BEEF COWS IN THE PRESENCE OF STOCHASTIC ELEMENTS AgEcon
Bentley, Ernest; Waters, James R.; Shumway, C. Richard.
Tipo: Journal Article Palavras-chave: Livestock Production/Industries.
Ano: 1976 URL: http://purl.umn.edu/29747
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DISAGGREGATED ANALYSIS OF SHORT-RUN BEEF SUPPLY RESPONSE AgEcon
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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DISCUSSION OF AGRICULTURAL ECONOMICS AND THE CHANGING STRUCTURE OF HIGHER EDUCATION AgEcon
Shumway, C. Richard.
Tipo: Journal Article Palavras-chave: Teaching/Communication/Extension/Profession.
Ano: 1976 URL: http://purl.umn.edu/29941
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DISTINGUISHING THE SOURCE OF MARKET POWER: AN APPLICATION TO CIGARETTE MANUFACTURING AgEcon
Raper, Kellie Curry; Love, H. Alan; Shumway, C. Richard.
We compare nonparametric and nonstructural market power tests using data from the cigarette manufacturing industry. Tests are implemented to examine both monopoly and monopsony power exertion by cigarette manufacturers. Results indicate that market power in the tobacco industry, previously attributed to monopoly power exertion, should at least in part be attributed to monopsony market power in the upstream tobacco market.
Tipo: Working or Discussion Paper Palavras-chave: Market power; Nonparametric; Nonstructural; Monopsony; Monopoly; Cigarette manufacturing; Agribusiness.
Ano: 1998 URL: http://purl.umn.edu/24021
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Do the Largest Firms Grow the Fastest? The Case of U.S. Dairies AgEcon
Melhim, Almuhanad; O'Donoghue, Erik J.; Shumway, C. Richard.
Replaced with revised version of paper 06/29/07.
Tipo: Conference Paper or Presentation Palavras-chave: Livestock Production/Industries; Productivity Analysis.
Ano: 2007 URL: http://purl.umn.edu/9763
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DOES CONSISTENT AGGREGATION REALLY MATTER? AgEcon
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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Does consistent aggregation really matter? AgEcon
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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ECONOMICS OF SWINE CROSSBREEDING SYSTEMS AgEcon
Merrell, Randall A.; Shumway, C. Richard; Sanders, James O.; Tanksley, T.D., Jr..
Tipo: Journal Article Palavras-chave: Livestock Production/Industries.
Ano: 1979 URL: http://purl.umn.edu/30039
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Empirical Tests of the Refutable Implications of Expected Utility Maximization under Risk AgEcon
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 paper to the more general case of both price and quantity uncertainty and result in an important theoretical finding. Empirical tests using a panel of state-level observations fail to reject most refutable hypotheses under output price and output quantity risk, but symmetry conditions implied by a twice-continuously-differentiable indirect utility function are rejected. Two restrictive risk preference hypotheses...
Tipo: Conference Paper or Presentation Palavras-chave: Indirect utility function; Refutable implications; Risk and uncertainty; Risk and Uncertainty.
Ano: 2005 URL: http://purl.umn.edu/19331
Registros recuperados: 58
Primeira ... 123 ... Última
 

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