If you have a weak economy and weak currency (which you have repeatedly printed in order to pay off debt, like Greece, Italy, etc) then your borrowing cost even

If you have a weak economy and weak currency (which you have repeatedly printed in order to pay off debt, like Greece, Italy, etc) then your borrowing cost eventually becomes high as banks get wise to your behaviour. If you switch to the Euro then your borrowing cost magically becomes low (since you cant unilaterally just print money). If your economy still doesnt reform then eventually you cant pay your euro debt… and you have the Greek situation. Can’t print, no-longer have a low-cost, low wage, low tax, low regulation economy (since you conformed to the EU/Euro area regulations). The trick for politicians is getting out of there before the public realises this.