In this paper we investigate whether markets with heterogeneous network externalities can belocked-in by old technologies even if superior technologies are available. Heterogeneous networkexternalities are present when some consumers care more about the size of the market share of agood than...

This discussion paper resulted in a publication in 'Industry and Innovation', 2011, 18(3), 317-334.<P> This article presents a model of sequential decisions about investments in environmentally dirty and clean technologies, which extends the path-dependence framework of Arthur (1989). This allows...</p>

This paper resulted in a publication in <A HREF="http://www.sciencedirect.com/science/article/pii/S0191261514000356"><I>Transportation Research Part B: Methodological</I></A> 64, 1-23.<P> This paper analyses optimal coarse tolling of congestion under heterogeneous preferences, and especially the welfare and distributional effects. With coarse tolling, the toll equals a fixed value...</p></i></a>

In studying congestion tolling, it is important to account for heterogeneity in preferences of drivers, as ignoring it can bias the welfare gains. We analyse the effects of tolling, in the bottleneck model, with continuous heterogeneity in the value of time and schedule delay. The welfare gain...