Characteristics of Demand for Pharmaceutical Products: An Examination of Four Cephalosporins
建模四种头孢菌素类药物的需求，计算品牌药与仿制药的自价格弹性和交叉价格弹性，发现仿制药间弹性很高，部分治疗替代品间弹性也显著。
We model demand for four cephalosporins and compute own- and cross-price elasticities between branded and generic versions of the four drugs. We model demand as a multistage budgeting problem, and we argue that such a model is appropriate to the multistage nature of the purchase of pharmaceutical products, in particular the prescribing and dispensing stages. We find quite high elasticities between generic substitutes and also significant elasticities between some therapeutic substitutes.