Two comparative models of intertemporal choice have recently been proposed as an alternative to the hyperbolic discounting model. One, the interval discounting model, retains the notion that intertemporal choice is governed by discounting, but proposes that discounting involves direct...

The delay-speedup asymmetry is that a positive outcome is discounted more, and a negative outcome is discounted less, when it is delayed than when it is “sped up” over the same interval. To account for this asymmetry, Loewenstein and Prelec's (1992) hyperbolic discounting model and Scholten...