Os autores dizem:
We offer an alternative explanation: the Catholic church retreated in the mid1960s from providing a variety of family-friendly services that had previously reduced the cost of Catholic childrearing. Nuns were key to the provision of those services, and the Second Vatican council of 1962–65 (known as “Vatican II”) led to a dramatic decline in the number of nuns (as well as priests) and thus raised the cost of childrearing.
Há também um modelo teórico microeconômico – elegante – e estimativas. As conclusões? Descubra aqui. Spoiler: não são as preferências que mudaram (^_^)