we have developed a very efficient supply chain, where stores generally keep on shelf what they expect to sell, and everything else stays in some warehouse somewhere.

stores restock every day; every week. there will not be supply shortages, just things out of stock until they get restocked the next day. For all we know, stores may start having things that are selling out quickly shipped to them in larger quantities.

This isn’t like the potato famine or similar where the actual production was disrupted, or a war or natural disaster where supply chains are disrupted, leading to real shortages. Just people buying in larger quantities than stores have stocked for.

If you can’t get what you need today, it’ll be there tomorrow, etc. While the stock market has crashed, retail stores are seeing their biggest profits in years. They have every incentive to keep restocking and even to respond by stocking in larger quantities during this time.