Vaccines are responsible for large increases in human welfare and yet we know little about the political impacts of …-out of vaccines relied on exogenous eligibility rules which we combine with a pre-analysis plan for causal identification. We … affiliation. Survey evidence suggests that vaccines could have increased preferences for challengers by lowering decision …

Computer and Internet use, especially in developing countries, has expanded rapidly in recent years. Even in light of … Internet penetration, both currently and over time, we examine panel data for 161 countries over the 1999-2004 period. We … factors associated with computer and Internet penetration do not differ substantially between developed and developing …