Testing the Quantity-Quality Fertility Model: The Use of Twins as a Natural Experiment
阐述了数量-质量生育模型的预测内容，提出利用双胞胎出生事件作为外生价格替代，并应用于印度家庭数据来检验模型。
The predictive content of the quantity-quality model of fertility and the empirical information required for verification under a minimal set of restrictions on the utility function is described. It is demonstrated that commodity-independent compensated price effects must be known to infer the existence of the unobservable interdependent shadow prices of the model with a relatively weak structure improsed on preference orderings. A method of using multiple birth events to substitute for these exogenous prices is proposed and applied to household data from India.