Papers of this type typically face several common challenges inestimating the price elasticity of demand for this population. First,noisy price imputation will lead to measurement error, generallybiasing elasticity estimates toward zero. This concern is especiallyacute with individual-level data, as those who chose not to enroll ina health plan are unlikely to perfectly remember the premium pricethey were offered. Second, elasticity estimates implicitly assumea homogenous insurance product, when in fact individuals whopay higher premiums may be obtaining more generous health carebenefits, again biasing elasticities toward zero.