The supply chain in the US has been pretty severely disrupted by changes in where the demand is. The food supply chain is very specialized. Companies like Sysco that mostly serve the food service industry (restaurants and cafeterias) are sucking air. Meanwhile, most large grocery chains have their own distribution systems, and they're scrambling to meet demand and more importantly changes in delivery. Everyone is trying to catch up to Amazon, and Amazon is going at a breakneck speed. Is this disruption caused by Covid-19? Partly yes, and the disruption that isn't caused by it has been accelerated by it.
Be that as it may, TG01's shortage anecdote is likely mostly caused by hoarding, as correctly identified by Solkern.
Same deal as toilet paper: we're not wiping our asses more, we're just wiping them in different places.
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