The flat rate would have been a guaranteed higher monthly bill that what she was paying at the time, for as you point out potentially higher usage. But if her desired price to pay was $20, and her average monthly bill was n, where n is below $20, why wasn&#x27;t she already using the service more, at the rate of $20-n?<p>And, again, the AOL anecdote was an illustration, not evidence. See the truffle study, we know more about this than your response suggests.