When an individual participates in the market for crime, there is a ch
ance he will encounter violence. Hence, only the individuals who have
a high tolerance for violence will participate in this market. If the
level of violence is itself determined by the degree of tolerance of t
hose who are active in the market, multiple equilibria can exist. Inde
ed, it is possible that the economy settles down in a high-violence eq
uilibrium, although a low-violence equilibrium is possible. Violence-r
educing policies like gun control are likely to have the desired effec
t, but this is not guaranteed. (C) 1997 by Elsevier Science Inc.