Using the SIR model Policy question:will a subsidy for vaccination be effective in controlling infectious disease? In the model,this policy question is equivalent to the dI* 瑞 mathematical question: >0 is dI*/dp >o? dp B+ This quantity depends on: oβ,infectivity of disease(+) dv/dI*,prevalence elasticity (+ dv/dp,effect of vaccine price on vaccination rate(+) Bhattacharya,Hyde and Tu-HealthEconomics Bhattacharya, Hyde and Tu – Health Economics Using the SIR model Policy question: will a subsidy for vaccination be effective in controlling infectious disease? In the model, this policy question is equivalent to the mathematical question: is dI*/dp >0? This quantity depends on: β, infectivity of disease (+) dv/dI*, prevalence elasticity (+) dv/dp, effect of vaccine price on vaccination rate (+)