• Conservation of wildlife. A bio-economic model of a wildlife reserve under the pressure of habitat destruction and harvesting outside the reserve 

      Skonhoft, Anders; Armstrong, Claire W. (Working paper; Arbeidsnotat, 2003-09)
      Biodiversity is today threatened by many factors of which destruction and reduction of habitats are considered most important for terrestrial species. One way to counteract these threats is to establish reserves with restrictions on land-use and exploitation. However, very few reserves can be considered islands, wildlife species roam over large expanses, often via some density dependent dispersal ...
    • Distributional effects of marine protected areas. A study of the North-East Atlantic cod fishery 

      Sumaila, Ussif Rashid; Armstrong, Claire W. (Working paper; Arbeidsnotat, 2003-01)
      This paper studies the distributional effects of the implementation of a marine protected area (MPA) for the North-East Atlantic cod stock. A bioeconomic cohort model with two agents targeting different age groups is used to examine how the establishment of an MPA may affect the payoffs to the two main vessel types used to exploit cod, namely, trawlers and coastal vessels. Cooperative and ...
    • Fishing on cold water coral reefs : A bioeconomic model of habitat-fishery connections 

      Kahui, Viktoria; Armstrong, Claire W. (Working paper; Arbeidsnotat, 2008-11)
      This paper applies a bioeconomic model in order to study different interactions between a harvested renewable resource and a non-renewable resource without commercial value that is negatively affected by the harvesting activity. This enables the analysis of for instance cold water coral habitats and their importance to commercial fish species. The fish is harvested either in a manner that does ...
    • Marine reserves. A bio-economic model with asymmetric density dependent migration 

      Armstrong, Claire W.; Skonhoft, Anders (Working paper; Arbeidsnotat, 2004-10)
      A static bioeconomic model of a marine reserve is introduced, allowing asymmetric density dependent migration between the reserve and the fishable area. This allows for habitat or ecosystem differences within and outside a reserve not described in earlier studies. Four scenarios are studied; a) maximum harvest, b) maximum current profit, c) open access and d) maximum sustainable yield (MSY) in ...
    • A note on the ecological-economic modelling of marine reserves in fisheries 

      Armstrong, Claire W. (Working paper; Arbeidsnotat, 2006-03)
      This paper gives an overview of bioeconomic modelling of marine reserves, and illustrates how economists have responded to the modelling results found in the ecological literature. The economic analysis is shown to be far more pessimistic with regard to the potential of marine reserves as a fisheries management tool, than what one finds in the purely ecological analysis, the reason being the ...
    • Product and process innovation in a differentiated goods duopoly 

      Clark, Derek J.; Armstrong, Claire W. (Working paper; Arbeidsnotat, 2006-09)
      This paper compares Bertrand and Cournot equilibria in a differentiated duopoly with R&D competition or cooperation, where R&D may affect both unit cost of production and the size of the market. This combination of product and process innovation is shown to allow for the reversal of some results found in earlier models that only look at one of the two types of R&D effects. We find that for a ...
    • Using history dependence to design a dynamic tradeable quota system under market imperfections 

      Armstrong, Claire W. (Working paper; Arbeidsnotat, 2003-11)
      A transferable quota system is analysed in a two-period model with market power. So far, the management mechanisms presented in the literature to remedy market power have either not succeeded in securing efficiency in the distribution of quota within and across time periods, or have resulted in only one of the two inefficiencies being eliminated. In this paper a new mechanism is introduced where ...
    • Økonomisk verdsetting av havmiljø : Anvendelse på havområdet utenfor Nordland 

      Armstrong, Claire W.; Kahui, Viktoria; Aanesen, Margrethe (Working paper; Arbeidsnotat, 2008-10)
      I sommer har konflikten om havområdene utenfor Lofoten-Vesterålen toppet seg, med sterke utspill fra fiskerhold om seismikkskyting på fiskefelt. Økende bruk av havet til ulike aktiviteter, det være seg fiske eller petroleumsvirksomhet, oppdrett, transport eller turisme, gjør at en bredere forståelse av hvilke verdier havet tilbyr er et viktig innspill i politiske avgjørelser. I dette arbeidet ...