It's easy to say "we live in a Just-In-Time Economy", but it's things like this that really demonstrate the implications.

The supply chain is set up to flow, so when demand drops or spikes up you get a flood or a shortage.

If there's a flood, some companies will go out of business, leaving the survivors with a bigger slice of the pie.

If there's a shortage, companies will respond, and some will over-react and build over-capacity and then fail when the shortage evens out, leaving the survivors with a bigger slice of the pie. I think this may happen with ventilator companies. After this event, there may be an over-supply of ventilators, leading to failure of some companies or lines of business.