Blar i Discussion papers (FOR) på forfatter "Sandal, Leif Kristoffer"
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More is less : the tax effects of ignoring flow externalities
Sandal, Leif Kristoffer; Steinshamn, Stein Ivar; Grafton, R. Quentin (Discussion paper, Working paper, 2000-11)Using a model of nonlinear decay of the stock pollutant, and starting from the same initial conditions, the paper shows that a tax that only corrects for stock externalities can, at the steady state, be higher than a tax ... -
A new approach of fitting biomass dynamics models to real data based on a linear total allowable catch (TAC) rule : an optimal control approach
Ussif, Al-Amin M.; Sandal, Leif Kristoffer; Steinshamn, Stein Ivar (Discussion paper, Working paper, 2000-05)A non-traditional approach of fitting dynamic resource biomass models to data is developed in this paper. The adjoint technique is an optimal control or a variational method for parameter identification. It provides a novel ... -
On the dynamics of commercial fishing and parameter identification
Ussif, Al-Amin M.; Sandal, Leif Kristoffer; Steinshamn, Stein Ivar (Discussion paper, Working paper, 2000-05)This paper has two main objectives. The first is to develop dynamic models of commercial fisheries different from the existing models. The industry is assumed to have a well defined index of performance based on which it ... -
Optimal fishing policy for two species in a three-species predator-prey model: The case of capelin, cod and juvenile herring in the Barents Sea
Aanestad, Sigurd; Sandal, Leif Kristoffer; Eide, Arne (Discussion paper, Working paper, 2007-12)This paper presents a management model for the Barents Sea capelin and cod fisheries including juvenile herring in the biological model as the young herring influences the cod-capelin system. The objective of the study is ... -
Optimal management of renewable resources : a general feedback approach
Sandal, Leif Kristoffer; Steinshamn, Stein Ivar (Discussion paper, Working paper, 1998-09)Analytical solutions for optimal exploitation of renewable capital stocks are derived as feedback rules for a quite general optimization problem. By feedback rules is meant that optimal exploitation is given as an explicit ... -
A perturbation approach on a class of optimal control problems, unifying the pontryagin and dynamic programming approach
Sandal, Leif Kristoffer; Berge, Gerhard (Discussion paper, Working paper, 2000-06)This article consider special ways of solving time dependent (non-autonomous) systems. Different types of time-dependent Optimal Control Problems in the setting of a Hamiltonian Formulation, are considered and the emphasis ... -
Pollution decay, consumer awareness and optimal carbon taxes
Sandal, Leif Kristoffer; Steinshamn, Stein Ivar (Discussion paper, Working paper, 2004-02)The effects of non-linear decay and consumer preferences are analyzed in a setting where optimal extraction of non-renewable resources is combined with stock externalities. The control is exercised via a corrective tax and ... -
Probabilistic cost efficiency and bounded rationality in the newsvendor model
Ubøe, Jan; Andersson, Jonas; Jörnsten, Kurt; Lillestøl, Jostein; Sandal, Leif Kristoffer (Doctoral dissertation;41/14, Working paper, 2014-12)In this paper we establish a link between probabilistic cost efficiency and bounded rationality in the newsvendor model. This establishes a framework where bounded rationality can be examined rigorously by statistical ... -
A simple approach to global optimal feedback solutions : with emphasize on certain management problems in economics
Sandal, Leif Kristoffer; Berge, Gerhard (Discussion paper, Working paper, 2001-06)Dynamic optimization problems covers a great class of problems in management science and technology. The classical problem formulations being the variational approach as in classical mechanics, like Hamilton's principle ... -
Stackelberg equilibria in a multiperiod vertical contracting model with uncertain and price-dependent demand
Sandal, Leif Kristoffer; Ubøe, Jan (Discussion paper;2012:2, Working paper, 2012-02)In this paper, we consider Stackelberg games in a multiperiod vertical contracting model with uncertain demand. Demand has a distribution with a mean and variance that depend on the current retail price, and this ... -
Stochastic optimization for multispecies fisheries in the Barents Sea
Poudel, Diwakar; Sandal, Leif Kristoffer (Discussion paper;02/14, Working paper, 2014-02)This study presents a multispecies stochastic model. The model suggests optimal fishing policy for two species in a three species predator prey ecosystem in the Barents Sea. We have employed stochastic dynamic programing ... -
Stochastic Stackelberg equilibria with applications to time dependent newsvendor models
Sandal, Leif Kristoffer; Øksendal, Bernt; Ubøe, Jan (Discussion paper, Working paper, 2011-05) -
A survey and analysis of outsourcing in East China
Fan, Tijun; Sandal, Leif Kristoffer; Kong, Jiehong; Li, Dandan (Discussion paper, Working paper, 2009-05)The aim of this study is to investigate whether outsourcing activities in east china are associated with a theoretical framework derived from the literature. By the methodology of Statistics Package for the Social Science ... -
The ensemble Kalman filter in bioeconomics
Kvamsdal, Sturla Furunes; Sandal, Leif Kristoffer (Discussion paper;2012:5, Working paper, 2012-05)We demonstrate the power of the Ensemble Kalman Filter in specifying ecosystem models ideal for bioeconomic analysis. Bioeconomic analysis requires models to be relatively simple, but models must still capture the nature ...