We derive a simple model for finding the optimal refund to be offered
to final consumers by manufacturing firms during rebate promotions. Th
e key features of our work are the explicit representations of the red
emption function, purchase acceleration, and rebuys by brand-switchers
. Depending upon a firm's objectives and given some generally accepted
assumptions about the firm's demand function, an optimal refund rate
exists that should be different than the short-term rebate rate.