• A bridge between continuous and discrete-time bioeconomic models: Seasonality in fisheries 

      Kvamsdal, Sturla F; Maroto, Jose M.; Moran, Manuel; Sandal, Leif Kristoffer (Journal article; Peer reviewed, 2017)
      We develop a discretization method to construct a discrete finite-time bioeconomic model, corresponding to bioeconomic models with continuous-time growth function, but allowing the analysis of seasonality in fisheries. The ...
    • Adaptive regulation with flow and stock externalities 

      Sandal, Leif Kristoffer; Steinshamn, Stein Ivar (Discussion paper, Working paper, 1998-01)
      In confronting a consumer good whose production process is associated with both flow and stock externalities, a corrective tax is introduced to restore efficiency. The objective is to maximize social welfare over time when ...
    • A maximum entropy approach to the newsvendor problem with partial information 

      Andersson, Jonas; Jörnsten, Kurt; Nonås, Sigrid Lise; Sandal, Leif Kristoffer; Ubøe, Jan (Discussion paper;2011:14, Working paper, 2011-08)
      In this paper, we consider the newsvendor model under partial information, i.e., where the demand distribution D is partly unknown. We focus on the classical case where the retailer only knows the expectation and variance ...
    • A maximum entropy approach to the newsvendor problem with partial information 

      Andersson, Jonas; Jörnsten, Kurt; Nonås, Sigrid Lise; Sandal, Leif Kristoffer; Ubøe, Jan (Journal article; Peer reviewed, 2013)
      In this paper, we consider the newsvendor model under partial information, i.e., where the demand distribution D is partly unknown. We focus on the classical case where the retailer only knows the expectation and variance ...
    • Analyzing risk of stock collapse in a fishery under stochastic profit maximization 

      Poudel, Diwakar; Sandal, Leif Kristoffer; Kvamsdal, Sturla Furunes (Discussion paper;2012:4, Working paper, 2012-04)
      In commercial fisheries, stock collapse is an intrinsic problem caused by overexploitation or due to pure stochasticity. To analyze the risk of stock collapse, we apply a relatively simple Monte Carlo approach which can ...
    • An analysis of maintenance schedules for public facilities 

      Hopland, Arnt Ove; Kvamsdal, Sturla F; Sandal, Leif Kristoffer (Journal article; Peer reviewed, 2019)
      We present a flexible, formal framework for maintenance scheduling for public facilities. Key features of the model include an accelerating deterioration scheme, a general utility measure, and real estate market effects ...
    • An approach to adaptive carbon taxes in the presence of global warming 

      Sandal, Leif Kristoffer; Steinshamn, Stein Ivar (Discussion paper, Working paper, 1998-01)
      The optimal extraction path of fossil fuels and the corresponding corrective tax on extraction are derived when two types of externalities associated with emission of carbondioxide (CO2) are taken into account. The optimal ...
    • Approximating closed form solutions to a class of feedback policies 

      Sandal, Leif Kristoffer (Discussion paper, Working paper, 2009-09)
      Dynamic optimization problems cover a large class of problems in theoretical and applied economics. A simple iterative algorithm with fast convergence is proposed. It is demonstrated that the algorithm in a few steps ...
    • Assimilation of real time series data into a dynamic bioeconomic fisheries model : an application to the Norwegian cod fishery stock 

      Ussif, Al-Amin M.; Sandal, Leif Kristoffer; Steinshamn, Stein Ivar (Discussion paper, Working paper, 2000-05)
      This paper combines the new and elegant technique of inverse methods and a Monte Carlo procedure to analyze real data for the Norwegian cod fishery (NCF) stock. A simple nonlinear dynamic resource model is calibrated to ...
    • Assimilation of time series data into a dynamic bioeconomic fisheries model : an application to the North East Arctic cod stock 

      Ussif, Al-Amin M.; Sandal, Leif Kristoffer; Steinshamn, Stein Ivar (Working Paper, Working paper; Working paper, 2003-01)
      This paper combines the elegant technique of Data Assimilation and a Monte Carlo procedure to analyze time series data for the North East Arctic Cod stock (NEACs). A simple nonlinear dynamic resource model is calibrated ...
    • A stitch in time saves nine : the costs of postponing action in climate policy 

      Steinshamn, Stein Ivar; Kvamsdal, Sturla Furunes; Sandal, Leif Kristoffer (Report;2011:16, Research report, 2011)
      The main purpose of this report is to investigate the effects of postponing implementation of a carbon tax assuming that externalities associated with climate change and global warming is real. Failing to internalize these ...
    • Comparative evaluation of the fisheries policies in Denmark, Iceland and Norway : multispecies and stochastic issues 

      Agnarsson, Sveinn; Arnason, Ragnar; Johannsdottir, Karen; Ravn-Jonsen, Lars; Sandal, Leif Kristoffer; Steinshamn, Stein Ivar; Vestergaard, Niels (Report, Research report, 2008-01)
      In this report the fisheries policies in Denmark, Iceland and Norway are subject to evaluation in a comparative perspective with particular emphasis on multi-species interaction and uncertainty. The actual harvest and ...
    • Continuous harvesting costs in sole-owner fisheries with increasing marginal returns 

      Maroto, Jose M.; Moran, Manuel; Sandal, Leif Kristoffer; Steinshamn, Stein Ivar (Discussion paper, Working paper, 2009-09)
      We develop a bioeconomic model to analyze a sole-owner fishery with fixed costs as well as a continuous cost function for the generalized Cobb-Douglas production function with increasing marginal returns to effort level. ...
    • Continuous harvesting costs in sole-owner fisheries with increasing marginal returns 

      Sandal, Leif Kristoffer; Steinshamn, Stein Ivar; Maroto, Jose M.; Moran, Manuel (Working paper, Working paper, 2009-06)
      We develop a bioeconomic model to analyze a sole-owner fishery with fixed costs as well as a continuous cost function for the generalized Cobb-Douglas production function with increasing marginal returns to effort level. ...
    • Data assimilation into biomass dynamics models : a Monte Carlo simulation experiment 

      Ussif, Al-Amin M.; Sandal, Leif Kristoffer; Steinshamn, Stein Ivar; Morey, Steven L. (Discussion paper, Working paper, 2001)
      In this paper, we use a variational data assimilation method to fit biomass dynamics models to simulated data. The method is the variational adjoint technique in which a cost function measuring the distance between the ...
    • Does stochasticity matter? : dynamic pigouvian taxation in an uncertain environment 

      Sandal, Leif Kristoffer; Steinshamn, Stein Ivar (Discussion paper, Working paper, 2004-04)
      The effects of discounting, stochasticity, non-linearities and maximum decay upon an optimal corrective tax are analyzed using stochastic dynamic optimization. Optimal corrective taxes are derived as explicit feedback ...
    • Do species interactions and stochasticity matter to optimal management of multispecies fisheries? 

      Poudel, Diwakar; Sandal, Leif Kristoffer; Steinshamn, Stein Ivar; Kvamsdal, Sturla Furunes (Discussion paper;2012:1, Working paper, 2012-01)
      The multispecies fisheries management looks at a bigger picture in addressing the long-term consequences of present decisions. This implies an ecosystem management that includes a number of species and their physical, ...
    • Dynamic cournot-competitive harvesting of a common pool resource 

      Sandal, Leif Kristoffer; Steinshamn, Stein Ivar (Working Paper, Working paper; Working paper, 2003-01)
      A variant of the classical harvesting game, where a number of competing agents simultaneously harvest a common-pool natural resource, is analysed. The harvesting at each time is a Cournot competition. The critical assumption ...
    • Dynamiske adaptive miljøavgifter 

      Sandal, Leif Kristoffer; Steinshamn, Stein Ivar (Rapport, Research report, 2001-04)
      Optimale CO2-avgifter finnes som en feedback-relasjon ved hjelp av dynamisk optimering. Objektfunksjonen er å maksimere velferden som består av summen av konsument- og produsentoverskudd i markedet for fossilt brennstoff ...
    • Dynamiske CO2-avgifter : en modell med endogent bestemt avgiftsperiode 

      Aanestad, Sigurd; Sandal, Leif Kristoffer; Berge, Gerhard (Discussion paper, Working paper, 2003-12)