That's why we need rationing in addition to anti price gouging laws. Anti price gouging laws make it riskier for people to buy large quantities with the intent to just sell it for a profit. If there was a high risk of punishment, people like the guys who went around Tennessee buying all of the available local supply of hand sanitizer with the intent to price gouge wouldn't have done so. Then rationing(like limits on how much of an item can be purchase at a time) would make it harder for individuals to buy more than they need. When there is a massive line of people just to get toilet paper and other basic necessities like we have seen at stores the past few days, people would be less likely to go through the hassle of finding the items and going through line again. Without a purchase limit, some people will completely fill up their carts leaving those who were not quick enough with less. The fear of people bulk buying the whole supply and the knowledge that people will do it to price gouge just increase the amount of panic and make more people feel the urge to go and buy in bulk.

https://www.marketwatch.com/story/tennessee-man-sitting-on-a...