to the management and staff of Green Bank for their cooperation, and to Put Your Money Where Your Butt Is: A Commitment Contract for Smoking Cessation †

"Quitting smoking is easy. I've done it a thousand times." -Mark Twain M ore than five decades after Robert H. Strotz (1955) modeled dynamic inconsistency, debate continues over how to represent preferences for consumption over time. 1 Introspection, casual empiricism, and laboratory evidence have motivated theorists to develop several classes of models in which consumers exhibit more impatience for near-term trade-offs than for future trade-offs. 2 The consumption of addictive substances has been a particular focus of such models