ISSN:0008-3976    

DOI:10.1111/j.1744-7976.1996.tb00187.x

出版商:Blackwell Publishing Ltd    

年代:1996

数据来源: WILEY

摘要:

Pour prévoir les changements dans les techniques de production engenderées par une modification de la structure de prix, la démarche micro‐économique usuelle repose sur la construction de fonctions de production et leur estimation économétrique. Nous proposons une autre méthode d analyse de ces changements, basée sur un modèle économique coupléà un simulateur agronomique de croissance des plantes, EPIC (Erosion Productivity Impact Calculator). Cet outil nous permet de simuler le comportement d‘optimisation du producteur dans son univers agronomique, et de déduire les conséquences des choix techniques sur certain. Paramètres d'environnement. Une application illustre les eff ets de la réforme de la Politique Agricole Commune (PAC) dans deux régions céréalières, françaises : la région de Toulouse (Midi‐Pyrénées) et la Beauce (Centre). Pour les deux premières années de la reforme, les prévisions établies sont proches des évolutions réelles. Dans les deux régions, la réforme aurait un impact sign‐cattfsur le développement des principales cultures etfavoriserait

ISSN:0008-3976    

DOI:10.1111/j.1744-7976.1996.tb00188.x

出版商:Blackwell Publishing Ltd    

年代:1996

数据来源: WILEY

摘要:

Based on the hypothesis of intertemporal cost minimization, this paper develops an error correction model to explain short‐run dynamics of machinery demand in aggregate Canadian agricultural production. The estimated model is subjected to a rigorous sequence of hypothesis tests to check for its statistical validity. In addition, various versions of the model that are nested within the most general model are also tested. Structural parameters of the intertemporal cost minimization problem are recovered from the parameter estimate

ISSN:0008-3976    

DOI:10.1111/j.1744-7976.1996.tb00189.x

出版商:Blackwell Publishing Ltd    

年代:1996

数据来源: WILEY

摘要:

British Columbia's Individual Vessel Quota (IVQ) system for Pacific halibut was implemented in 1991. Part of the anticipated benefits of an IVQ program for a formerly derby‐style fishery are derived from additional revenues generated from an increased season length, which allows for more of the product to be marketed fresh and for new market niches to be developed. This paper is one of the first to empirically examine the ex vessel price effects and the resulting revenue effects of an IVQ system for a derby fishery in which IVQs are imposed. It is found that the price received for B.C. Pacific halibut has increased substantially over what it would have been is there were no IVQ program, and that the price increase grew during the four years during which the program was implemented. The total revenue benefit from the IVQ system to the B.C. fishers over the four years examined totaled C$23·22 milli

ISSN:0008-3976    

DOI:10.1111/j.1744-7976.1996.tb00190.x

出版商:Blackwell Publishing Ltd    

年代:1996

数据来源: WILEY

摘要:

The Atlantic salmon has been harvested by both commercial and recreational fishers for many years on the river systems of the province of New Brunswick on Canada 's Atlantic coast. The commercial fisheries were closed and controls were placed on the recreational fisheries following the 1983 collapse of the salmon stocks. This management policy remains in effect. A preliminary analysis using a linear control model showed this to be an economically efficient harvest allocation policy on New Brunswick's Miramichi River. The analysis is extended to the more realistic nonlinear framework here to determine whether the harvest allocation decision would be significantly changed. Both fisheries are found to generate positive net economic benefits, although the recreational fishery is determined to be more valuable than the commercial fishery. Permanent closure of the commercial fishery is not indicated.

ISSN:0008-3976    

DOI:10.1111/j.1744-7976.1996.tb00191.x

出版商:Blackwell Publishing Ltd    

年代:1996

数据来源: WILEY

摘要:

The Morishima Elasticity of Substitution (MES) is often used to measure the change in relative factors for a change in price. This paper develops a generalized factor ratio elasticity of substitution (FRES) that nests the MES as a special case. By comparing the FRES with the MES under cost minimization, output or utility maximization, and profit maximization, this paper shows the narrow conditions under which the MES can be correctly interpreted as a measure of the percentage change in relative factors for a percentage change in price. An empirical example demonstrates how misleading the MES can be for this purpose.

ISSN:0008-3976    

DOI:10.1111/j.1744-7976.1996.tb00192.x

出版商:Blackwell Publishing Ltd    

年代:1996

数据来源: WILEY

摘要:

The traditional travel cost model operates on the assumption that choices are made regarding the number of trips to various sites over an entire recreation season. This paper uses actual recreation data to test the consistency of this model with postulates of rational economic choice as embodied in the axioms of revealed preference. The paper assumes consumer rationality and examines the effects of alternative trip prices and model structures on the degree of consistency between them and the axioms of choice. Using tests developed by Varian and Tsur, the authors find that site choices at prices proxied by travel costs for most individuals in the sample violate the axioms. The violations are quite large when time costs, both in traveling and on‐site, are omitted from the prices. When they are included, violations are almost as numerous, but not as large. The paper also examines demand heterogeneity by stratifying the sample and repeating the nonparametric tests. These findings suggest caution be used in interpreting welfare measures derived from traditional travel cost models, especially those that do not include measures of time value. The authors’ approach provides a method for screening travel cost data and preparing for model selection and estimat

ISSN:0008-3976    

DOI:10.1111/j.1744-7976.1996.tb00193.x

出版商:Blackwell Publishing Ltd    

年代:1996

数据来源: WILEY

摘要:

Book reviewed in this article:Forestry, Agriculture and the EnvironmentValuing Food Safety and NutritionJulia A. CaswellAgroecology: The Science of Sustainable AgricultureMiguel A. AltieriAchieving Diversity: The Status and Progress of Women and African Americans in the Agricultural Economics ProfessionEdited by Mary A. Marchant and Handy Williamson, Jr.

ISSN:0008-3976    

DOI:10.1111/j.1744-7976.1996.tb00194.x

出版商:Blackwell Publishing Ltd    

年代:1996

数据来源: WILEY