This paper considers a model in which all exchange is mediated by contracts. The analysis explores the indexation of labor and commodities contracts to observable variations in government spending ﬁnanced by money creation. In one of the many equilibria, prices and nominal wages are shown to be independent of current money shocks. Except in the extreme equilibrium exhibiting full indexation, policy shocks will generate correlated movements in output and employment over time. The analysis thus suggests an inverse relationship between indexation of contracts and persistence of policy eﬀects.