The inability of governments to pre-commit to certain policies often r
esults in Pareto-inefficient equilibria. A policy is not time-consiste
nt if it requires a course of action that will subsequently become und
esirable. This paper examines the possibility of creating constitution
al rules which can support sovereign debt contracts which would otherw
ise violate the requirement of time-consistency. The possibility of es
tablishing international reputation with internal enforcement mechanis
ms is sensitive to the constitutional environment, which will also det
ermine the appropriate form of the constitutional rules.