title: Testing the quantity-quality fertility model: the use of twins as a natural experiment.
authors.forename: M R
authors.initials: MR
authors.lastname: Rosenzweig
authors.forename: K I
authors.initials: KI
authors.lastname: Wolpin
mesh_terms: D002648:Child; D003710:Demography; D004467:Economics; D005191:Family Characteristics; D005298:Fertility; D007182:Income; D008962:Models, Theoretical; D010298:Parity; D011153:Population; D011157:Population Dynamics; D012106:Research; D012942:Social Sciences
keywords: Child Worth; Demographic Factors; Economics; Fertility; Households; Income; Models, Theoretical; Parity; Population; Population Dynamics; Research Methodology; Research Report; Social Sciences