The power-sharing deal was struck on a pledge to renegotiate the terms of the bailout, arguing that the economy is now too weak to impose any more austerity. Greece wants another two years to meet its targets.
But Greece's rescue creditors are hesitant to give the country more time, saying it has only itself to blame for missing most of its reform targets over the past two years.
"The difficulties that Greece is currently experiencing do not stem from the (EU-IMF) program," senior ECB official Joerg Asmussen said bluntly on a visit to Athens this month. "They stem from many years of unsustainable economic policies and a reluctance to implement the necessary reforms."
EU officials believe that giving Greece the extra time to meet its deficit targets could undermined the overall rescue deal because it would require giving Greece new financial support. Many eurozone nations are increasingly reluctant to hand over more rescue money.
Greece's long list of unfulfilled commitments includes overhauling the tax system, ending delays in privatization and public land usage, scrapping dozens of state agencies, and reforming the health system and backlogged judiciary.
Samaras conceded this week that a renegotiation of Greece's bailout terms was unlikely in the short term, because the country is still in a "weak position" and because of the financial turmoil elsewhere in Europe.
Some investors worry that eurozone countries could give up on Greece and stop giving it rescue loans. Facing default, the country could potentially have to drop out of the euro bloc.
The eurozone has no provisions for a member being expelled, but the threat hangs over the country. That creates uncertainty for businesses and scares away foreign investment.
If Greece were to quit the common currency, its new currency would rapidly lose value against the euro. That would cause savings — converted from euros — to shrink. The cost of consumer goods — from food to fuel — would skyrocket as the country imports most of it.
Greek savers would rush to pull their euros out of banks before the money gets converted into the new, less valuable currency. That could cause bank runs, bringing down the financial system.
It would also deliver a severe blow to the property market, state benefits and salaries, according to predictions by bank researchers and parties backing the government coalition.
The financial catastrophe, they argue, would trigger widespread social unrest, in a country already seething with anger.
Public discontent with the government's policies is one key reason why the country is struggling to recover its financial health.
It triggered Greece's political crisis last year after defections from the then-Socialist government forced it to seek partners in a six-month coalition.
Strikes and protests have died down since the start of the crisis, but the political atmosphere has become increasingly hostile.
The impact of the public anger was also evident in the latest general elections. The two parties that dominated politics for four decades, the conservative New Democracy and Socialist PASOK lost more half their support as voters fled to anti-bailout parties that accuse the political establishment of massive corruption and of allowing the country to be humiliated.
Alexis Tsipras, the left-wing opposition leader, has refused to meet with the debt inspectors, arguing their policies are leading the country to ruin.
"Very simply, this program will not work," he told parliament this week. "New cuts will cause an even worse recession in an economy already destroyed."
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