Rare for whom? At any point in time this is happening in many countries around the world.

I don't see how the frequency changes my assertion though. That's the regular boom/bust cycle from capitalism. There are many theories on why that happens but the fact is: they happen.

Well were it even a cycle. It's an even increasing oscillation until it explodes and corrective action is taken.

I hope this time it will be corrected... permanently.