This is another example of how modern economies are driven by individual choices about participation--in this case teachers refusing to provide service because they don't feel safe. The same choices are devastating a wide range of industries like aviation, hospitality, tourism, etc.

It's a little mindboggling that so many political leaders do not understand this basic concept. Economics is far from perfect but the effect of the pandemic on economic behavior was about as close to a slam dunk prediction as you can get.