By Ying Cui and Pedro Martins
Schooling typically delivers significant private returns, with better educated individuals generally receiving higher earnings. However, the schooling of one person has also the potential to generate significant positive effects on other individuals, through formal and informal social interactions between them. Economists refer to these spillovers as ‘externalities’. These third-party effects also explain the wedge between private and social returns to education: while the former are typically estimated at 5% to 10%, the latter can be as high as 10% to 20%.