The ensuing chain reaction will upend markets around the world and will almost surely lead to more defaults among the European Union's (EU) other debt-plagued nations, collectively known as the PIIGS (Portugal, Ireland, Italy, Greece and Spain).
The bond markets have already passed sentence, with the yield on two-year Greek bonds spiking to an astronomical 76% yesterday (Tuesday). Yields on 10-year Greek bonds rose to 24%.
By comparison, the 10-year bond yields of another PIIGS nation, Italy, rose to 5.74%. Meanwhile, bond yields for the EU's strongest economy, Germany, have dropped below 2%.
The credit default swap (CDS) markets, where investors can insure their bond purchases against default, agree with the bond markets' verdict. As of Monday it cost $5.8 million and $100,000 annually to insure $10 million worth of Greek debt for five years, which means the CDS market now considers default a 98% probability.
Most European stock markets have been hammered over the past several weeks, with some dropping as much as 25%.
"Default is inevitable," said Money Morning Global Investment Strategist Martin Hutchinson. "Greeks are paid about twice as much as they should be, and that gap can't be solved by austerity."
How Soon is NowIn recent weeks Germany has shown more reluctance to dig deeper into its own pockets to bail out Greece and the other PIIGS. At the same time, Greece has struggled to implement the austerity measures that are required if it is to continue receiving aid from the European Central Bank (ECB) and the International Monetary Fund (IMF).
Greece's budget deficit has increased 22% this year, while its economy is projected to shrink more than 5%.
Every new development appears to bring Greece closer to the brink of default - and some see that happening in the very near future.
"My guess is there will be a Greek debt default by the end of this fiscal quarter - yeah, that means very soon," said Money Morning Capital Waves Strategist Shah Gilani.