Figure 2

Vaccine allocation with and without compliance to travel restrictions. Change over time in the optimal and pro rata allocations (A,B) and the corresponding infection levels (C,D) for State 1 (in blue, the initially lowest-burdened state) and State 2 (in red, the initially highest-burdened state) depending on whether there is compliance to travel restrictions (A,C) or not (B,D) for the case where the vaccine capacity constraint is 10% and immunity is permanent. Note the changing y-axis in panels (C) and (D) in order to better highlight the infection levels.