We develop a theory of general equilibrium with endogenous debt limits
in the form of individual rationality constraints similar to those in
the dynamic consistency literature. If an agent defaults on a contrac
t, he can be excluded from future contingent claims markets trading an
d can have his assets seized. He cannot be excluded from spot markets
trading, however, and he has some private endowments that cannot be se
ized. All information is publicly held and common knowledge, and there
is a complete set of contingent claims markets. Since there is comple
te information, an agent cannot enter into a contract in which he woul
d have an incentive to default in some state. In general there is only
partial insurance: variations in consumption may be imperfectly corre
lated across agents; interest rates may be lower than they would be wi
thout constraints; and equilibria may be Pareto ranked.