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A Comparison of Parametric Approximation Techniques to Continuous-Time Stochastic Dynamic Programming Problems AgEcon
Kompas, Tom; Chu, Long.
We compare three parametric techniques to approximate Hamilton-Jacobi-Bellman equations via unidimensional and multidimensional problems. The linear programming technique is very efficient for unidimensional problems and offers a balance of speed and accuracy for multidimensional problems. A comparable projection technique is shown to be slow, but has stable accuracy, whereas a perturbation technique has the least accuracy although its speed suffers least from the curse of dimensionality. The linear programming technique is also shown to be suitable for problems in resource management, including applications to biosecurity and marine reserve design.
Tipo: Journal Article Palavras-chave: Stochastic dynamic programming; Parametric approximation; Perturbation; Projection; Linear programming; Optimal fishing; Marine reserves; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy; C61; C63; Q22.
Ano: 2010 URL: http://purl.umn.edu/95044
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A Preliminary Study of the International Marketing of Shrimp AgEcon
Castellini, Alessandra; Ragazzoni, Alessandro; Valentini, T..
This paper aims to supply a comprehensive account of a particular sector of the fisheries industry. TH increase of demand for fish products has involved an uncontrolled exploitation of marine reserves and fishing has reached its threshold of biological sustainability. For these reasons, aquaculture has grown in a corresponding manner in the recent past. The present survey starts from these considerations and aims to describe the general situation of world-wide, European and Italian aquaculture and then to examine the farming and marketing of a particular kind of product, Penaeus spp., which significantly affects global production in terms of value but not of quantity.
Tipo: Conference Paper or Presentation Palavras-chave: Aquaculture and Fishery; Shrimp farming; International trade; International Relations/Trade; Livestock Production/Industries; Marketing; Q13; Q17; Q22.
Ano: 2005 URL: http://purl.umn.edu/56077
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A Spatial Econometric Analysis of Compliance with an International Environmental Agreement on an Open Access Resource AgEcon
Borsky, Stefan; Raschky, Paul A..
This paper provides an empirical analysis of the role of intergovernmental relations on a country's effort to enforce the objectives of an international environmental agreement on an open access resource. Intergovernmental interaction allows signatory countries to observe compliance behavior of other signees and to punish non-compliance by applying bi- and multilateral sanctions. We use a cross-sectional dataset that contains country level information about compliance with Article 7 of the 1995 UN Code of Conduct for Responsible Fisheries. Our identification strategy combines a spatial autoregressive model with spatial autoregressive disturbances and an instrumental variable approach. We find a strong positive effect of other countries' compliance on the...
Tipo: Presentation Palavras-chave: International environmental agreements; Open access resources; Spatial econometrics; Environmental Economics and Policy; C21; F53; Q22.
Ano: 2012 URL: http://purl.umn.edu/124425
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A Study on Consumer Behaviour at Organized Fish Retail Outlet AgEcon
Mugaonkar, Pankajkumar Hanmantrao; Ananthan, P.S.; Samal, Suman Sekhar; Debnath, Biswajit.
Indian consumers have been buying fish from the unhygienic fish markets, but of late fish has become available at many of the multi-format retail outlets. Consumers’ behaviour at organized fish retail outlets in Mumbai has been studied. The majority of consumers are young (25-35 years) and belong to upper middle class. Fresh fish is the preferred choice and about 60 per cent consumers have emphasized on freshness rather than price of fish. About 97 per cent consumers have recently shifted to organized retail outlets from local markets for purchasing fish. The majority of consumers (84.3%) have been found to be species-specific while buying fish. Quality and convenience have been found to be the major factors responsible for shift from local markets....
Tipo: Journal Article Palavras-chave: Organized retailing; Purchasing behaviour; Consumer’s awareness; Fish and fisheries products; CIFE technology; Agricultural and Food Policy; Q13; Q22.
Ano: 2011 URL: http://purl.umn.edu/109511
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Are Preferences for Environmental Quality Sensitive to Financial Funding Schemes? Evidence from a Marine Restoration Programme in the Black Sea AgEcon
Remoundou, Kyriaki; Koundouri, Phoebe; Adaman, Fikret; Nunes, Paulo A.L.D..
This paper uses a non-market valuation study to elicit consumers’ preferences for a marine restoration programme in the Black Sea aiming to reduce the level of public health risk from bathing and improve water quality and the overall level of marine biodiversity. In this context, we administer a stated choice experiment in coastal settlements in Ukraine and Turkey and employ two tax revenue reallocation schemes as payment vehicles. One proposes the financing of the marine restoration programme by the reduction of the public budget for renewable energy and the second by the reduction of the public budget on training for civil servants. We examine the stated preferences and the subsequently derived economic value estimates in the two treatments with the aim...
Tipo: Working or Discussion Paper Palavras-chave: Non-Market Valuation; Stated Choice Experiment; Payment Vehicle; Tax Revenues Reallocation; Marine Resources; Black Sea; Marine Biodiversity; Developing Countries; Environmental Economics and Policy; Q22; Q28.
Ano: 2011 URL: http://purl.umn.edu/108204
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Assessing the Competitiveness of EU Mediterranean Fisheries and Aquaculture Industries AgEcon
Polymeros, Konstantinos; Tsakiridou, Efthimia; Mattas, Konstadinos.
An attempt is made to evaluate the competitiveness of the fisheries and aquaculture industries of some Mediterranean countries. Revealed Comparative Advantage indices of Italian, French, Greek, Portuguese and Spanish fish products are estimated, in order to gain new insights regarding the position of these products in the market of the European Union, in terms of competitiveness. In addition, this study sheds light on the evolution of competitiveness over the last decade. The estimated Comparative Advantage indices reveal that there is a wide range of competitiveness among fish products in Mediterranean countries. In addition, almost all countries alter their competitive ranking throughout the study period. Consequently, Mediterranean fisheries and...
Tipo: Conference Paper or Presentation Palavras-chave: Competitiveness; Exports; Fish products; Mediterranean countries; Livestock Production/Industries; Q17; Q22; F14.
Ano: 2005 URL: http://purl.umn.edu/56004
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Asset Pricing in Created Markets for Fishing Quotas AgEcon
Newell, Richard G.; Papps, Kerry L.; Sanchirico, James N..
We investigate the applicability of the present-value asset pricing model to fishing quota markets by applying instrumental variable panel data estimation techniques to 15 years of market transactions from New Zealand's individual fishing quota market. In addition to the influence of current fishing rents (as measured by lease prices), we explore the effect of market interest rates, risk, and expected changes in future rents on quota asset prices. Controlling for these other factors, the results support a fairly simple relationship between quota asset and contemporaneous lease prices. Consistent with theoretical expectations, the results indicate that quota asset prices are positively related to declines in interest rates, lower levels of risk, expected...
Tipo: Working or Discussion Paper Palavras-chave: Tradable permits; Individual transferable fishing quota; Asset pricing; Fisheries; Policy; Resource /Energy Economics and Policy; Q22; Q28; D40; L10.
Ano: 2005 URL: http://purl.umn.edu/10639
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Bang for the Buck: Cost-Effective Control of Invasive Species with Different Life Histories AgEcon
Buhle, Eric; Margolis, Michael; Ruesink, Jennifer L..
Strategies for controlling invasive species can be aimed at any or all of the stages in the life cycle. In this paper we show how to combine biological data on population dynamics with simple economic data on control cost options to determine the least costly set of strategies that will halt an invasion. We then apply our methods to oyster drills (Ocinebrellus inornatus), an economically important aquaculture pest that has been accidentally introduced worldwide. If the costs of intervention were the same across life stages, extermination of adults would be an inefficient way to control species with the population dynamics characteristics of invaders. In the oyster drill case, however, efficient control targets adults because they are much easier to find.
Tipo: Working or Discussion Paper Palavras-chave: Invasive species; Bioeconomics; Control strategies; Environmental Economics and Policy; Q10; Q2; Q22.
Ano: 2004 URL: http://purl.umn.edu/10793
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Bioeconomic Evaluation of Substitution of Balanced Feed with Chaya (Cnidoscolus Chayamansa) Leaves in Tilapia Production AgEcon
Poot-Lope, Gaspar Roman; Gasca-Leyva, Eucario.
In Mexico, the culture of tilapia has developed in rural areas, where the main problem is low producer income. The state of Yucatan also experiences this situation, and scarcity of money needed to purchase inputs results in complementary feeding with chaya (Cnidoscolus chayamansa), whose leaves are edible for humans and animals. In this situation, CINVESTAV conducted experiments to determine the optimal level of substitution of balanced feed with ray chaya leaves. The test with 25% and 50% reduced balanced feed complemented with chaya (ad libitum) did not show significant differences (P>0.05) in growth compared to fishes fed with a complete ration of balanced feed (100% feed table). A bioeconomic model was developed, including a submodel of growth...
Tipo: Conference Paper or Presentation Palavras-chave: Bioeconomic model; Cost minimization; Tilapia; Livestock Production/Industries; O13; Q22.
Ano: 2005 URL: http://purl.umn.edu/55999
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Buyback Programs for Capacity Reduction in the U.S. Atlantic Shark Fishery AgEcon
Larkin, Sherry L.; Keithly, Walter R., Jr.; Adams, Charles M.; Kazmierczak, Richard F., Jr..
Declining fishery stocks, increasing fishing effort and adverse market conditions have produced difficult financial situations for fishermen worldwide. Several high-valued fisheries are considered to be overcapitalized. The purchase and permanent retirement of fishing vessels and/or permits under a buyback program is one approach for reducing fishing capacity. Evidence from previous programs, however, suggests that buybacks are not a panacea for solving overcapacity problems. Whether such programs can help rebuild stocks and improve the financial condition of fleets in any specific fishery depends on a multitude of factors. We consider the potential of a buyback program for the U.S. Atlantic shark fishery.
Tipo: Journal Article Palavras-chave: Buyback programs; Fishing capacity; Fishing permits; Latent permits; Marine fisheries; Vessel decommissioning schemes; Q22; Q28.
Ano: 2004 URL: http://purl.umn.edu/43423
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Buyback Programs: Goals, Objectives, and Industry Restructuring in Fisheries AgEcon
Kirkley, James E.; Walden, John B.; Waters, James R..
National Oceanic and Atmospheric Administration Fisheries has conducted several buyback programs to reduce harvesting capacity in fisheries. These programs have attempted to maximize capacity reduction given a fixed budget. However, restructuring issues have not been considered. We explore the possibility of satisfying three different buyback objective We examine the black sea bass trap fishery and determine the number of vessels given different allowable catch levels and objectives of maximizing technical efficiency, capacity utilization, and vessels in the fishery. We find considerable variation in the number of vessels allowed to remain in the fishery given the different objectives.
Tipo: Journal Article Palavras-chave: Capacity utilization; Data Envelopment Analysis; Fishery buyback programs; Fishing capacity; C61; D24; Q22; Q28.
Ano: 2004 URL: http://purl.umn.edu/43422
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Buyer and Seller Responses to an Adverse Food Safety Event: The Case of Frozen Salmon in Alberta AgEcon
Maynard, Leigh J.; Saghaian, Sayed H.; Nickoloff, Megan.
Fish is a low-fat protein source high in omega-3 fatty acids, but in 2004 consumers also heard that farmed salmon had high levels of polychlorinated biphenyl (PCBs). This research evaluated how Canadian consumers and processors reacted to the conflicting health messages. Demand estimates and time-series analysis of 2001-2006 frozen meat scanner data in Alberta, Canada show a significant drop in salmon expenditure share following the PCB finding. The industry responded by launching low-priced wild salmon products, which contributed to significant demand expansion. The analysis illustrates how a food safety threat was averted and even served as a catalyst for growth.
Tipo: Journal Article Palavras-chave: Salmon; Scanner data; Food safety; Demand; Directed acyclic graphs; Demand and Price Analysis; Food Consumption/Nutrition/Food Safety; Research Methods/ Statistical Methods; Q10; Q11; Q16; Q22.
Ano: 2008 URL: http://purl.umn.edu/53629
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Can Co-Management Improve the Governance of A Common- Pool Resource? Lessons From A Framed Field Experiment in A Marine Protected Area in the Colombian Caribbean AgEcon
Moreno-Sanchez, Rocio del Pilar; Maldonado, Jorge Higinio.
Complexities associated with the management of common pool resources (CPR) threaten governance at some marine protected areas (MPA). In this paper, using economic experimental games (EEG), we investigate the effects of both external regulation and the complementarities between internal regulation and non-coercive authority intervention—what we call co-management—on fishermen’s extraction decisions. We perform EEG with fishermen inhabiting the influence zone of an MPA in the Colombian Caribbean. The results show that co- management exhibits the best results, both in terms of resource sustainability and reduction in extraction, highlighting the importance of strategies that recognize communities as key actors in the decision-making process for the...
Tipo: Working or Discussion Paper Palavras-chave: Common-pool resources; Governance; Co-management; Experimental economic games; Fisheries; Latin America.; Environmental Economics and Policy; C93; C72; D02; D70; Q01; Q22; Q28; C23; C25.
Ano: 2009 URL: http://purl.umn.edu/60731
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Catch-Quota Balancing in Multispecies Individual Fishing Quotas AgEcon
Sanchirico, James N.; Holland, Daniel S.; Quigley, Kathryn; Fina, Mark.
Individual fishery quotas (IFQs) are an increasingly prevalent form of fishery management around the world, with more than 170 species currently managed with IFQs. Yet, because of the difficulties in matching quota holdings with catches, many argue that IFQs are not appropriate for multispecies fisheries. Using on-the-ground-experience with multispecies IFQ fisheries in Iceland, New Zealand, Australia, and Canada, we assess the design and use of catch-quota balancing mechanisms. Our methodology includes a mix of interviews with fishery managers, industry representatives, and brokers, literature review, and data analysis. We find that a combination of incentives and limits on use rates for the mechanisms provide sufficient flexibility to the quota owner...
Tipo: Working or Discussion Paper Palavras-chave: Natural resources; Created markets; Tradable permits; Resource /Energy Economics and Policy; Q22; Q28; D40; L10.
Ano: 2005 URL: http://purl.umn.edu/10543
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Cod today and none tomorrow: The Economic Value of a Marine Reserve AgEcon
Grafton, R. Quentin; Kompas, Tom.
The northern cod fishery was once one of the world’s largest capture fisheries. Using data from the fishery, this research calculated the economic value of a marine reserve using a stochastic optimal control model with a jump-diffusion process. The analysis shows that, an optimal-sized marine reserve in this fishery would have prevented the fishery’s collapse and generated a triple payoff. Even if harvesting had been ‘optimal’ the profits from fishing would have been raised. The recovery time would also have decreased for the biomass to return to its former state and smoothed fishers’ harvests and profits. Following a negative shock, the chance of a catastrophic collapse would have been lowered.
Tipo: Report Palavras-chave: Marine reserves; Stochastic control; Fisheries; Environmental Economics and Policy; C61; Q22.
Ano: 2009 URL: http://purl.umn.edu/94822
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Consumer Awareness, Perceptions and Behaviour Towards Farmed Versus Wild Fish AgEcon
Verbeke, Wim; Brunso, Karen.
This study provides empirical evidence about European consumer awareness, perceptions and behavior towards farmed and wild fish. The evidence is based on three empirical studies: a consumer survey in Belgium in March 2003, focus group discussions with consumers in Belgium and Spain in May 2004, and a pan-European consumer survey with a sample of 4,786 fish consumers in Belgium, the Netherlands, Denmark, Span and Poland in November-December 2004. Consumer awareness about the farmed or wild origin of fish is rather poor, particular among lighter fish user groups. Perceptions are quite diverse across Europe. Furthermore, perceptions often contrast with current scientific evidence, in particular with respect to behalf and nutritional value where consumers...
Tipo: Conference Paper or Presentation Palavras-chave: Attitude; Aquaculture; Consumer; Fish; SEAFOODplus; Food Consumption/Nutrition/Food Safety; Livestock Production/Industries; D12; M31; Q13; Q22.
Ano: 2005 URL: http://purl.umn.edu/56075
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Credit Accessibility, Risk Attitude, and Social Learning: Investment Decisions of Aquaculture in Rural Indonesia AgEcon
Miyata, Sachiko; Sawada, Yasuyuki.
This study examines the factors that influenced poor Indonesian farmers to invest in floating net aquaculture after being relocated due to a reservoir construction project. To compare three primary decision factors, credit accessibility, risk attitudes, and social learning, (i.e., learning effects from others’ experience), we analyze 16 years of socio-economic retrospective data collected in the field interviews exclusively for this study. Our analysis reveals that credit accessibility and risk attitudes are the most important factors that influence the rate of aquaculture investment. Social learning as well as household education also influences the investment decision significantly. Our results suggest that developmen t projects that involve voluntary...
Tipo: Conference Paper or Presentation Palavras-chave: Household investment decision; Credit constraints; Risk attitudes; Social learning; Panel data; Farm Management; D1; D8; D12; Q22.
Ano: 2006 URL: http://purl.umn.edu/25669
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Designing a Cost-Effective Marine Reserve Network: A Bioeconomic Metapopulation Analysis AgEcon
Sanchirico, James N..
Marine reserves are gaining attention around the world as a tool to both conserve ocean resources and improve the productivity of fisheries. Using simulation analysis, we investigate in a limited-entry fishery comprising nine subpopulations the inherent bioeconomic trade-offs associated with cost-effective designs of marine reserve networks' that is, the trade-offs between the degree of connectedness of a site and the biological and economic heterogeneity. We find in many cases that closing two low-value patches can result in larger biological gains and lower costs than closing one high-value patch. We also simulate biological productivity effects after creation of a reserve and find that under special conditions, aggregate sustainable rents are maximized...
Tipo: Working or Discussion Paper Palavras-chave: Limited-entry; Marine reserve networks; Spatial management; Resource /Energy Economics and Policy; Q22.
Ano: 2003 URL: http://purl.umn.edu/10624
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Does Scarcity Exacerbate the Tragedy of the Commons? Evidence from Fishers’ Experimental Responses AgEcon
Maldonado, Jorge Higinio; Moreno-Sanchez, Rocio del Pilar.
Economic Experimental Games (EEGs), focused to analyze dilemmas associated with the use of common pool resources, have shown that individuals make extraction decisions that deviate from the suboptimal Nash equilibrium. However, few studies have analyzed whether these deviations towards the social optimum are affected as the stock of resource changes. Performing EEG with local fishermen, we test the hypothesis that the behavior of participants differs under a situation of abundance versus one of scarcity. Our findings show that under a situation of scarcity, players over-extract a given resource, and thus make decisions above the Nash equilibrium; in doing so, they obtain less profit, mine the others-regarding interest, and exacerbate the tragedy of the...
Tipo: Working or Discussion Paper Palavras-chave: Tragedy of the commons intensified; Economic experimental games; Resource abundance; Resource scarcity; Dynamic effects; Community/Rural/Urban Development; Environmental Economics and Policy; Institutional and Behavioral Economics; Land Economics/Use; Public Economics; D01; D02; D03; O13; O54; Q01; Q22; C93; C72; C73; C23.
Ano: 2009 URL: http://purl.umn.edu/91170
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Dynamic Effects of Grain and Energy Prices on the Catfish Feed and Farm Sectors AgEcon
Muhammad, Andrew; Zheng, Hualu.
This study examines the dynamic effects of grain prices and energy prices on catfish feed prices and the price of food-sized catfish at the farm level. Using the autoregressive distributed lag model and bounds testing procedure, a long-run relationship between feed and farm prices and their determinants was confirmed. Given the effect of corn and soybean meal prices on catfish feed prices, and catfish fish feed prices on farm prices, the long-run responsiveness of feed prices to a percentage increase in U.S. ethanol production is 0.325, and the responsiveness of catfish farm prices is 0.064. Although both feed and farm prices increase with ethanol production, the relatively small responsiveness of farm prices when compared with feed prices suggests that...
Tipo: Journal Article Palavras-chave: Catfish; Prices; Autoregressive distributed lag (ARDL) model; Ethanol; Feed; Corn; Soybeans; Agribusiness; Agricultural Finance; Demand and Price Analysis; Financial Economics; Institutional and Behavioral Economics; Marketing; Production Economics; Productivity Analysis; Resource /Energy Economics and Policy; C32; Q11; Q22.
Ano: 2010 URL: http://purl.umn.edu/100520
Registros recuperados: 62
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