A few billion euro to begin with.
The UK has enormeous outstanding obligations that the EU has offered to take care of for them in exchange for a paltry down payment* of a fraction of the money the UK promised.
(*unaccurately and dishonestly portrayed as a "divorce bill" by the UK, and its politicans and media outlets)
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If you are of age and still didn't get to vote then that is on your nation state, not on the EU.
Since all member states of the EU are sovereign nations the EU left the details of the organisation of the voting process up to the member states.
Unfortunately some botched it (like the UK), but most did an adequate job. If you didn't get a say, maybe show up for the vote next time?
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Yes, but what you are calling for is an uncontrolled wage devaluation down to zero.
(The controlled version is called "austerity", it is when you are still able to priorize what is most important so people don't starve instead of simply turning everything over to the rich (and foreign banks) and hope for the best.)
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Geek politicans would probably have taken that as an invitation to crash their economy again, and harder this time, secure in the knowledge that Germany would have their back. That would have made the situation in Greece even worse in the long run.