Over 60% of US households with credit cards are currently borrowing |i.e., paying interest |on those cards (Gross and Souleles 2000). We attempt to reconcile the high rate of credit card borrowing with observed levels of lifecycle wealth accumulation. We simulate a lifecycle model with five properties that create demand for credit card borrowing. First,
Laboratory and field studies of time preference find that discount rates are much greater in the short-run than in the long-run. Hyperbolic discount functions capture this property. This paper presents simulations of the savings and asset allocation choices of households with hyperbolic preferences. The behavior of the hyperbolic households is com-pared to the behavior of