Showing 31 - 40 of 16,623
There is now increasing recognition that the world's marine ecosystems, especially coastal areas and semi-enclosed seas, are suffering from degradation and modification due to human influences. One of the most serious problems is nutrient enrichment, which in the long term harms productivity and...
Persistent link: https://www.econbiz.de/10011608361
We present a continuous, nonlinear, stochastic and dynamic model for capital investment in the exploitation of a renewable resource. Both the resource stock and capital stock are treated as state variables. The resource owner controls fishing effort and the investment rate in an optimal way....
Persistent link: https://www.econbiz.de/10009368521
La explotación de recursos de uso común constituye la única fuente de ingresos de una porción significativa de hogares en países en desarrollo. El objetivo de este documento es mostrar empíricamente que cuando un recurso de uso común escasea, esto ocasiona un crecimiento demográfico tal...
Persistent link: https://www.econbiz.de/10005014484
This paper models the use of community sanctions to restrict effort in a simple Gordon-Shaefer style model of the fishery with heterogeneous fishing costs.
Persistent link: https://www.econbiz.de/10005660633
Two agents possess the fishing rights to a lake. Each period they have two options, to catch without restraint, e.g., to use a fine-mazed net, or to catch with some restraint, e.g., to use a wide-mazed net. The use of a fine-mazed net always yields a higher immediate catch than the alternative....
Persistent link: https://www.econbiz.de/10005765308
Canada's Pacific salmon fisheries are again in a crisis of declining stocks, excess fishing effort and poor returns. Changes in fisheries management which may help resolve some of these problems include licence buy-backs, individual transferable quotas, additional effort controls, single gear...
Persistent link: https://www.econbiz.de/10005776037
This paper examines how to harvest a biomass confronted with the threat of partial extinction. We show that the uncertainty involved gives rise to two opposing effects determining an optimal steady-state stock of the biomass. A "discount effect", leading to a smaller stock as compared to the...
Persistent link: https://www.econbiz.de/10005749781
This paper examines how to harvest a biomass exposed to a potential collapse at an uncertain date. A specific recovery effect is identified which may be positive or negative. In general, the effect on the optimal biomass is indeterminate and depends upon the failure rate, the expected collapse,...
Persistent link: https://www.econbiz.de/10005783542
The methodologies of economic valuation of environmental services are still poorly apply (use) in Mexico, in part because of the lack of information systematized on the matter of the reaches and limits of itself. The present carries out a dissertation on some of the methodologies on the matter,...
Persistent link: https://www.econbiz.de/10008509701
This paper examines how to harvest a biomass exposed to a potential collapse at an uncertain date. A specific recovery effect is identified which may be positive or negative. In general, the effect on the optimal biomass is indeterminate and depends upon the failure rate, the expected collapse,...
Persistent link: https://www.econbiz.de/10008546305