This paper sheds light on the questions, Why does knowledge spill over? and How does knowledge spill over? The answer to these questions lies in the incentives confronting scientists to appropriate the expected value of their knowledge considered in the context of their path-dependent career...

This Paper elaborates on the recent race to sequence the human genome. Starting from the debate arising from the genome case on public versus private research, the Paper shows that in some fundamental research areas, where knowledge externalities play an important role, market and non-market...

In this paper we question the common wisdom that more polarized voters’ opinions imply larger policy polarization. We analyze a voting model in which the source of the polarization in voters’ opinions is “correlation neglect”, that is, voters neglect the correlation in their information...

It is widely believed that the current recession has soured public attitudes towards immigration. But most existing studies are cross sectional and can shed little light on the economy-wide forces that shift public opinion on immigration. In this paper I use the six rounds of the European Social...

An intense debate on the use of limited-voting shares developed in the UK during the 1950s. Using a unique hand-collected dataset, we show that negative news coverage of limited-voting shares is associated with an increase in the relative price of voting and limited-voting shares (the voting...

This paper has three goals. The first (and perhaps the most important one) is to provide a new compilation of data on ethnic, linguistic and religious composition at the sub-national level for a large number of countries. This data set allows us to measure segregation of different ethnic,...