COVID has definitely taught us all about supply & demand: TP & PT hoarding, meat & dry-foods hoarding, soaps & detergents, disinfectants, the list goes on.
Logistics was another teachable: for example, the only reason many airlines have not gone under is because they morphed to accommodate the crisis by flying cargo between cities. Most airline flights you've seen in the earlier days of COVID? No passengers at all...just cargo.
I hope the powers-that-be learned this time for the next time a pandemic hits, in order to curb street-level opportunism & shystery. That much could've been prevented, rather than the Karens & Kierans of the world loading up carts with water, paper hygiene products and the like to buy and play Stan Zbornak with for a quick, undeserved fortune. I saw this first-hand...thankfully, most of them were socially shunned, banned by eBay & Craigslist, and now sit amid their wares, which no longer carry the value they counted on. And the stores wisely refused their returns, ha-ha. The stores should've limited quantities to start with...they did not.
Greed in a pandemic is a terrible thing; hopefully, if there is a next time, it is punished harder than it was this time.