The article looks at how family background affects how much money people make from going to school. The researchers used data from a survey to see how parental education and family size impact earnings. They found that men from bigger families earn less from schooling, while the effect of parental education is smaller. The study also showed that using a certain method to estimate the effects of education gives higher results than usual. This suggests that there is a consistent return to schooling, along with biases that affect how much money people make.