Chong, Alberto y Martín Valdivia (2018). Health Impacts of a Public–Private Partnership Rural Roads Maintenance Programme. En: Journal of International Development. 

The authors provide evidence of health impacts of a public-private rural roads maintenance programme in Peru, which is characterized by a contracting mechanism that employs small local firms. Using a difference‐in‐differences approach, they find that improved roads connectivity leads to positive health externalities.