It was a while ago and I’d have to ask her to see if she remembered. But if it had been providing large gains for little work I expect she’d have kept on doing it, so conversely, I suppose it was providing little gain for large work.
Which doesn’t really contradict the claim that you “could be spending substantially less money on food if [you] used an online coupon service”. That claim is probably literally true, it just ignores the fact that in your situation the monetary savings were not worth the time/effort cost.
Much not-exactly-wrong advice falls down by ignoring opportunity cost.
It was a while ago and I’d have to ask her to see if she remembered. But if it had been providing large gains for little work I expect she’d have kept on doing it, so conversely, I suppose it was providing little gain for large work.
Which doesn’t really contradict the claim that you “could be spending substantially less money on food if [you] used an online coupon service”. That claim is probably literally true, it just ignores the fact that in your situation the monetary savings were not worth the time/effort cost.
Much not-exactly-wrong advice falls down by ignoring opportunity cost.
This is consistent with the purpose of coupons, to enable price discrimination by offering discounts only for people with more time than money.