&gt;If your model contains infinities, it&#x27;s automatically unhelpful; that takes you into Pascal&#x27;s Wager territory. If the damage is infinitely bad, then it it would justify draconian measures against even trivial risks of too many plastic bags. But however bad they are, they&#x27;re not infinitely bad. Such a model would justify arbitrarily high bag fees, not some piddling ten cents with the hope of changing long-term consumer behavior.<p>Sometimes that&#x27;s the reality of the situation, there are things that cannot be priced. That&#x27;s why we don&#x27;t consider a murder tax an acceptable way to deal with homicide.