I recall seeing a piece John Stossel did (for "20/20" I think) back after hurricane Katrina ...
Apparently, the people down there were getting countless truckloads of donated bottled water - so much of it that they could have gone swimming in the stuff if they had wanted to. Some lady who was being interviewed said that they didn't want or need any more water, but that they desperately needed generators. Some guy in Tennessee or (ironically) Kentucky saw the interview and managed to put together enough money to rent a truck and buy a bunch of generators from Lowe's or Home Depot or some such place. (This guy was unemployed at the time, IIRC.) Then he headed down there to sell those generators to the people who so badly needed them. Of course, he charged as much as the market would bear - and as a result, after selling a few of them, he was reported and arrested for "price gouging." All the remaining generators he had were seized and warehoused as "evidence" of his "crime"- and throughout the rest of the aftermath of the Katrina disaster, those brand-new generators gathered dust, remaining unused by anyone ...
As part of his story, Stossel interviewed the prosecutor who had handled the case.
The smug prick actually boasted about how he had "protected" the victims of Katrina from the vile depredations of an exploitative "price gouging" interloper ...
(I leave it as an exercise for the reader to consider what kind of incentives were thereby signalled to others who might have acted to fill the urgent need for generators - were potential suppliers more likely to say "hey, let's get some generators down there to those people!" or were they more likely to say "meh, to hell with it!" ... ?)