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. 2021 Jan 18;93:102473. doi: 10.1016/j.jmateco.2021.102473

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Fig. 4 — Time evolution of the cost functional (left), share of infectives (center) and social distancing policy (right) in the case of COVID-19 at Italian national level. Optimal duration of social distancing: $T = 16.09$ if $i_{0} = 0.02$ , $T = 11.12$ if $i_{0} = 0.03$ , and $T = 8.81$ if $i_{0} = 0.04$ .