|
|
|
| Registros recuperados: 14 | |
|
| |
|
| |
|
| |
|
|
| 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 |
| |
|
|
| Kompas, Tom; Che, Tuong Nhu. |
| Deregulation of the Australian dairy industry, specifically the removal of price subsidies to ‘market milk’, as well as ongoing drought in many dairy regions, has placed considerable pressure on farm cash income and a search for ways in which dairy farms can be made to operate more efficiently. Using traditional farm survey data and a unique biannual data set on farm technology use, this paper estimates a stochastic production frontier and technical efficiency model for dairy farms in New South Wales and Victoria, determining the relative importance of each input in dairy production, the effects of key technology variables on farm efficiency, and overall farm profiles based on the efficiency rankings of dairy producers. Results show that production... |
| Tipo: Journal Article |
Palavras-chave: Australian dairy farms; Dairy production and efficiency; Dairy technology; Stochastic production frontier; Livestock Production/Industries. |
| Ano: 2006 |
URL: http://purl.umn.edu/116921 |
| |
|
|
| Grafton, R. Quentin; Akter, Sonia; Kompas, Tom. |
| Marine protected areas (MPA) potentially offer a wide range of use and non-use benefits. These include critical habitat protection, conservation of marine biodiversity, recovery of threatened and endangered marine species, and increased biomass of targeted marine species. To assess whether such benefits exceed the potential costs, we provide the first-ever comprehensive ex-ante, socio-economic guide to MPA evaluation. Our framework shows how to quantify four key values of MPAs: consumptive, non-consumptive, indirect, and non-use values. The framework also shows how to use decision tools to determine the desirability of establishing MPAs. Overall, the guide offers the promise of improved information and better decision making for marine protected areas. |
| Tipo: Report |
Palavras-chave: Marine protected areas; Use value; Non-use value; Benefit-cost analysis.; Environmental Economics and Policy. |
| Ano: 2009 |
URL: http://purl.umn.edu/94827 |
| |
|
|
| Kompas, Tom; Che, Tuong Nhu. |
| In this paper efficiency gains and associated cost reductions from increases in traded quota are estimated with a stochastic cost frontier for the Australian South East Trawl Fishery (SETF). Estimation of this frontier also provides key information on the relative importance of input costs in the SETF, returns to scale, variations in costs as a result of trade in quota and the economic performance of each fishing vessel, year to year. Final estimations indicate that increases in the volume of quota traded have resulted in considerable efficiency gains and cost reductions in the SETF, ranging from 1.8 to 3.5 cents per kilogram for surveyed vessels for every one per cent increase in the volume of quota traded, or 1 to 2.4 per cent of total variable costs,... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Individual transferable quotas; Stochastic cost frontier; Fishery efficiency; International Relations/Trade; Q22; Q28. |
| Ano: 2003 |
URL: http://purl.umn.edu/57907 |
| |
|
|
| Fox, Kevin J.; Grafton, R. Quentin; Kompas, Tom; Che, Tuong Nhu. |
| We present the first ex post study that quantitatively analyses the effects of a licence buyback and enhanced quota trading on the profitability and productivity of individual vessels in a fishery. Using firm-level data and a profit index decomposition method, we find that small and large vessels and three different trawler fleets all experienced substantial productivity gains in the year immediately following a licence buy-back and the establishment of a quota brokerage service. The apparent ongoing benefits of the buy-back and increased quota trading over the sample period are in stark contrast to the generally unfavourable long-term outcomes commonly associated with vessel buy-backs in input-controlled fisheries. |
| Tipo: Journal Article |
Palavras-chave: Capacity reduction; Fishery; Productivity; Quota trading; Productivity Analysis. |
| Ano: 2006 |
URL: http://purl.umn.edu/116929 |
| |
|
|
| Kompas, Tom; Chu, Long. |
| We use a bang-bang optimal control model to derive a rule of thumb for an optimal management of invasive weeds, in terms of the marginal benefits and costs of various control actions. Instead of determining the size of infestation under an optimal surveillance measure, the rule specifies the types of land where an invasive weed should be first prevented from establishment, and under what conditions control should be initiated. The types of land are modeled via the heterogeneous vulnerability of land to the weed and likely infestation. This easy-to-use rule is applied to determine how hawkweed should be controlled in Australia, across three potential control strategies: containment, eradication and no action. We investigate this rule-of-thumb in both... |
| Tipo: Journal Article |
Palavras-chave: Stochastic optimal control; Biosecurity; Invasive weed management; Hawkweed; Crop Production/Industries. |
| Ano: 2010 |
URL: http://purl.umn.edu/95046 |
| |
|
| |
|
| |
|
|
| Nhu Che, Tuong; Kompas, Tom; Vousden, Neil. |
| This article develops a dynamic model to account for the enhanced incentive effects that result from market reform through a move toward private property rights and competitive markets. Reform is captured through an emerging profits function which depends on effective prices and incentives to work harder. Static and dynamic output gains from reform are derived through increases in total factor productivity and induced capital accumulation. The model is applied to rice production in Vietnam over the period 1976–94. The more extensive is market reform, the larger the effects found on rice output, the capital stock and transitional growth rates, suggesting that incentives and more competitive markets matter greatly. |
| Tipo: Journal Article |
Palavras-chave: Crop Production/Industries; Marketing. |
| Ano: 2001 |
URL: http://purl.umn.edu/117727 |
| |
| Registros recuperados: 14 | |
|
|
|
