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Evolution of states with optimal controls (δ, 0, 0) – without any testing – for three different values of α, the discount rate that reflects the expected arrival time of a vaccine (and a cure). The plain line is the benchmark scenario discussed in Section 3.2; the dotted line corresponds to α = 1∕500, dashed line corresponds to α = 1∕250 and the mixed line corresponds to α = 1∕100.
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