What! The market responds to such silly things? After all, the Greeks only want us to support them. They just don’t want to have to work for their money...wonderful life and all.
This is pretty serious - I’ve seen different numbers, but assume Greece has at least 300 billion in total debt, much of that to private banks in Europe, but also the US. If they default, the consequences are completely uncertain. It is a bigger even the Lehman Brothers. I’m optimistic that this won’t crash international markets, but it is a big enough even that it could be 2008 all over again.