If Greece exits the eurozone, what actually happens to the existing debt? And will their currency actually have a lot of value? Just seems like a huge mess and I'm thankful I'm nowhere involved with it. I can't imagine what it's like for everyone involved.
If Greece exit the eurozone nothing happens with the existing debt. Greece will create a new money and will work to pay the debt. Only if the pays which are the proprietary of the debt decides to forget part of the debts only in this occasion that part of debt will not be paid. But not because want the Greece. But because the donators has decides to not taken that part.