Fig. 2. Average break-even cost across the six vaccination scenarios by income group (US$).

Panel a shows the average break-even cost when vaccination occurs at age 0, and Panel b shows the average break-even cost when vaccination occurs at age 5. We assume a 3% discount rate and VSLY equal to three times GDP per capita (constant 2015 US$). GDP per-capita levels and growth rates differ by income group. The colored bars represent the average break-even cost across the six vaccination scenarios, while the black bars denote its variation. Please note that the scales of the y-axes differ between the two panels.