## Animations of Figure 1 as *e* is varied.

Fig 1 animated; varying enforcement cost (*e*) from 0 to 5, with *N*=10:

Fig 1 animated; varying enforcement cost (*e*) from 0 to 5, with *N*=20:

Fig 1 animated; varying enforcement cost (*e*) from 0 to 5, with *N*=50: