Regional Externalities: an Introduction.- Regional Externalities: an Introduction.- Transport.- Modelling Transport in an Interregional General Equilibrium Model with Externalities.- External Effects in Road Traffic: the Pigou-Knight Model and its Extension to Situations With Endogenous Speed Choice and Heterogeneous Traffic.- On Traffic Congestion Models à la Mohring and Harwitz.- Local Collectors Versus Major Infrastructural Works.- Clusters and Product Chains.- Regional Differentiation and Location of Industrial Capacity in the Slovak Republic.- Automobile Sector in the Slovak Republic: Current Situation and Future Prospects.- IT Market and E-Commerce in Transition Economy: Network Externalities.- International Outsourcing in the Netherlands.- Regional Externalities and Clusters: a Dutch Network Case-Study.- Spatial Dimension of Externalities and the Coase Theorem: Implications for Co-existence of Transgenic Crops.- Regional Policy.- Abatement of Commuting’s Negative Externalities by Regional Investment in Houses and Buildings.- Risk as an Externality in Quantitative and Marginal Approaches.- Macro Policies and Regional Impacts in Norway.- The Economics of Tree-planting for Carbon Mitigation: A Global Assessment.- Positive Spillovers of Energy Policies on Natural Areas in Poland: an AGE Analysis.