This paper analyses the effects of peak load pricing on welfare. It introduces a model with three firms, two airlines and one airport, in a two-stage game that solves the airlines duopoly problem in a Bertrand game and the airport’s profit maximisation. Conclusions are different from others in precedent works, which stresses the importance of putting all firms together in the game. Mainly, resu...

This is a survey of the Steiner tree problem with profits, a variation of the classical Steiner problem where, besides the costs associated with edges, there are also revenues associated with vertices. The relationships between these costs and revenues are taken into consideration when deciding which vertices should be spanned by the solution tree. The survey contains a classification of the pr...

This paper gives an up-to-date estimate of the costs of road accidents in Iran. Conventional methods of estimating costs are considered together with special factors which apply to Iran. An attempt is made to quantify direct and indirect costs of accidents, including considerations relating to the exercise of Shar'ia law. The overall results show that road accidents account for between 1.4 and ...