Well, can I have two? Price Inflation AND higher Taxes? In and of itself a Greek bankruptcy or bond default should -in theory- not affect the Euro as such very much, Greece being maybe 3% of the total. However, just as a Californian bankruptcy would reflect badly on the "state of the Union" as a whole so would the default of on EU country, coupled with the rising interest rates and thus further destabilisation of the remaining over-leveraged member states, make investors wonder when sovereign default across the board is likely. Thus they wouldn't commit themseves to bonds of longer maturity and that's the beginning of the end.