They'll restock tomorrow and a large proportion of people who saw the empty shelves today will buy more than they would normally to make sure that they don't go without, leading to empty shelves, goto 10.

Supply chains are intact but they can't deal with this level of demand immediately and so there's going to be a period in which there are shortages. How long those shortages last depend not only demand but on other factors, e.g. how many people in the supply chain are directly or indirectly affected by the virus.