Greece is in a "Great Depression" similar to the American one in the 1930s, the country's Prime Minister Antonis Samaras has told former US president Bill Clinton.
Mr Samaras' comments come days before a team of international lenders arrives in Athens to call for more austerity measures if the debt-laden country wants to qualify for further rescue payments and avoid a chaotic default.
Athens wants to soften the terms of a €130bn bailout agreed last March with the EU and the IMF, to lessen their impact on an economy going through its worst post-war recession.
By the end of this year Greek GDP is expected to have shrunk by about a fifth in five consecutive years of recession since 2008, hammered by tax hikes, spending cuts and wage reductions required by two EU/IMF bailouts.
Unemployment climbed to a record 22.6% in the first quarter.
"You had the Great Depression in the United States," Mr Samaras told Mr Clinton, who was visiting Greece as part of a delegation of Greek-American businessmen.
"This is exactly what we're going through in Greece - it's our version of the Great Depression."
Athens must reduce its budget deficit below 3% of GDP by the end of 2014, from 9.3% of GDP in 2011 - requiring almost another €12bn in cuts and higher taxes on top of the €17bn successive governments have cut from the budget shortfall.
Greece wants its lenders to give it two more years to achieve the budget goal to avoid an even deeper economic slump but its lenders have opposed the idea because it would imply an even bigger financial aid to the country.
Highlighting growing frustration with Athens, German magazine Der Spiegel reported today, without citing sources, that the IMF may not take part in any additional financing for Greece.
The German and Greek finance ministries declined to comment on the report, which suggested additional support required for Athens could range from €10-50bn.
Officials have already indicated there would be a shortfall on the current bailout. How much is likely to depend on the extent by which Greece misses its fiscal targets and the extent of support needed to keep its major banks afloat.
The inspection team of the international Troika of the EU, the IMF and the ECB will focus on the €11.7bn of spending cuts Athens needs to take in 2013 and 2014.
Mr Clinton criticised Greece's lenders for focusing excessively on austerity, saying Athens will be more likely to repay its debt if it manages economic recovery first.
"[It] is self-defeating... if every day people are saying this may or may not work to give us back a 100 cents on the dollar, so give us more austerity today," he told Mr Samaras.
"People need something to look forward to when they get up in the morning - young Greeks need something to believe in so they can stake their future out here," Mr Clinton said.