Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
In an influential paper, Acemoglu et al. (2008) find that the positive correlation between income per capita and the level of democracy across countries vanishes once country-specific effects are accounted for. In this paper, we find evidence of a non-linear effect from income to democracy even after controlling for country-specific effects. In particular, our findings point to the existence of a positive effect only in low-income countries.