Total Factor Productivity (TFP)is often used on the macro-economic level as an indicator of changes in efficiency of a country. In many transition economies TFP is seen to have been negative the last decade of the plan economy and starts increasing and become positive after a (quite a) few years...

We derive and discuss a general, but simple geographical economics model with congestion, allowing us to explain the economic viability of small and large locations. The model generalizes some previous work and lends itself to analyzing the impact of public policy in terms of infrastructure...

This discussion paper has resulted in a chapter in: (R.U. Ayres, D. Simpson, and M. Toman (eds.)), Scarcity and Growth in the Millennium, 2005, Resources for the Future, Washington DC, 177-97.