This thesis addresses to what extent childhood family composition – the number of siblings and whether the parents live together, or whether there are non-parental adults and/or half-siblings in the household or not – contributes to variations in adult earnings. The theoretical perspective suggests that resources mediate the effect. While research has shown that siblings, as well as divorce and remarriage, are negatively linked to child outcomes, there are inconsistencies in previous literature. There has been debate over the unconfoundedness of previous studies, something that is handled here by analyzing large sets of representative data using a robust parameter. The longitudinal dataset used is based on Swedish administrative data and the cohorts analyzed are born in the beginning of the 1970s. The data structure is well suited for the assumptions underlying the semi-parametric method propensity score matching. The findings show that family size impacts on adult earnings. However, this is not always of concern. For example, no effect of siblings is found in affluent families, and if siblings are closely spaced this results in better outcomes for children. Divorce and remarriage do not seem to lower the future earnings of children. Thus, this thesis shows that some of the most well-established patterns in the sociology of the family, namely the link between number of siblings and adult earnings, and between divorce/family re-formation and adult earnings, can be broken by resources.

In this thesis, I analyze whether nutritional intake at the time of adolescence can impact academic attainment and earnings later on in life. Millions of children in the United States are living in food insecure households and do not have access to an adequate nutritious diet. Since adolescence is a time period of intense growth and development, it is essential to meet nutritional needs at this time. Using data from the Longitudinal Study of Adolescent to Adult Health (Add Health), I measure the nutrition of a nationally representative sample of youth in the United States through their daily food intake, and test the effects nutrition during adolescence has on future outcomes. I find a positive relationship between healthy eating and educational achievement, as well as a negative relationship between unhealthy eating and educational attainment. Nutrition has a smaller effect on earnings, but the results show that there is a minor negative relationship between healthy eating and earnings.