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system
what effect would sovereign default of a european country have on personal debt or a mortgage?
user
if the default happens through mass monetary inflation rather than openly ("we're not paying interest on our bonds") then make sure you pay off your house.  there may not be a very long window to do so. if the currency becomes worthless, then it depends on what you have of value that would be accepted by the lender as payment.  if you don't have anything, the lender will take it back, as they're probably entitled to on the notes.
assistant