SIR model Vaccination rate(v) Birth------ Depends on price of vaccination and prevalence of disease Susceptible Infected V=(p,It) ▣Infection rate(s,t) ▣Depends on how fast it spreads and prevalence Recovered ▣β=disease-specific AdsSt Aalt contagiousness measure s=旺 d月 Death Bhattacharya,Hyde and Tu-HealthEconomicsBhattacharya, Hyde and Tu – Health Economics SIR model  Vaccination rate (vt )  Depends on price of vaccination and prevalence of disease  vt = (p, It )  Infection rate (λSI,t)  Depends on how fast it spreads and prevalence  β = disease-specific contagiousness measure  λSI,t = βIt