Greek opinion polls showed voters warming to parties supporting the European Union's bailout agreement as political leaders at home and abroad warned of economic catastrophe should the single currency fragment.
New Democracy, which supports the plan negotiated with international lenders, was placed first in all six opinion polls published on Sunday as campaigning continued for next month's general election.
Antonis Samaras, the party's leader, sought to sketch out the consequences of a euro exit, saying Greek incomes, bank deposits and property values would lose at least half their value within days, while food prices would rise by a quarter.
"No society, no economy and no democracy can tolerate such a sudden collapse in so little time," he said.
As the Spanish Government this week prepares to channel €19 billion ($31 billion) to the Bankia group to restore confidence to its banking sector, Greek electoral rhetoric alluded to what might happen if the debt crisis deteriorates.