Does family size affect the prevalence of domestic violence? Using nationally-representative survey data from Samoa, which has among the world’s highest fertility rates, I extend the classic work on child quantity-quality trade-offs to also consider domestic violence. Identification is based on instrumental variable (IV) strategies exploiting three distinct and plausibly exogenous drivers of additional fertility: (1) same-sex sibling pairs in families with two or more children, (2) multiple births (twin), and (3) a female firstborn. I find evidence of a direct causal link between family size and an increased prevalence of intimate partner violence by, on average, 5 percentage points, equivalent to a 13 percent increase. This significant effect is largely driven by physical or sexual abuse often associated with serious victim injuries. The IV estimates also suggest that larger families tend to have attitudes that condone violent behaviour. The normalisation of violent behaviour in larger families may be linked to a lack of resources available to effectively address and resolve conflicts, ultimately contributing to an increased likelihood of violent incidents. These findings highlight the need for greater awareness of the potential victimisation risks for larger families and the importance of integrated family planning and domestic violence prevention efforts.

Dyah Pritadrajati is a PhD student at the Arndt-Corden Department of Economics, Australian National University, with a focus on applied microeconomics and development economics. Her research interests revolve around the intersection of labour economics, social policy, gender, and education. She obtained her BSc in Economics from Gadjah Mada University and holds an MSc in Economics for Development from the University of Oxford, as well as an MPhil in Economics from the University of Cambridge.