Parents preferring sons tend to go on to have more children until a boy is born, and to concentrate investment in boys for a given number of children (sibsize). Thus, having a brother may affect child education in two ways: an indirect effect by keeping sibsize lower and a direct rivalry effect...

Parents preferring sons tend to have more children until a boy is born and concentrate investment in boys for a given number of children (sibsize). Thus, having a brother may affect a child's education in two ways: an indirect effect by keeping sibsize lower and a direct rivalry effect where...