Greece might default.

For the moment, Greek officials are adamant that neither a default nor a euro exit and devaluation is in the cards. One senior policy maker in Greece’s Finance Ministry, who declined to be identified because of the delicacy of the matter, even offered to send his questioner a case of 2005 Dom Perignon Champagne if Greece ever repudiated its debt.

But close followers of Greece’s budget dynamics point to the fact that, despite the country’s deficit woes, by next year Greece is likely to have achieved a primary budget surplus, meaning that after taking out the high levels of interest it pays on its debt, it will be running a surplus.

History shows that a country tends only to take such a drastic step as cutting ties with its international lenders when it has tightened its belt enough to achieve a budget surplus, and it is only payments to its bankers that is keeping it in the red.

Such was the case in most of the recent country defaults, including Argentina, Ecuador, Indonesia and Jamaica, economists at the I.M.F. found in a paper published last year that addressed when a country finds its interest is served by default.

“My view is that it is very much in Greece’s interest to default now, as there is no prospect that it can repay its debt,” said Desmond Lachman, a former I.M.F. economist at the American Enterprise Institute. “If it is inevitable that an insolvent Greece is going to have to restructure, it would be better for Greece to do it now.”