Greece in dept

But Greece could be only the beginning. Investors now have to wonder if citizens of other European nations will also pull their support for the deal -- which could essentially amount to the unraveling of the euro zone as we know it."This is far more serious than the bank contagion that we are trying desperately to avoid. If a Greek referendum prevails, it's hard to imagine there not being calls for similar votes in other European nations," said Daniel Alpert, managing director of Westwood Capital, an investment bank in New York.You'll notice that the word "if" is sprinkled throughout many of the quotes. And that's the big problem. All that investors can do at this point is guess about what the future holds for Europe. That's a heck of a lot more terrifying than anything you probably saw on Halloween yesterday. Heighway said he's hopeful that Greek voters will not undo last week's deal. But that isn't comforting investors yet. The euro was below $1.37 against the dollar Tuesday and Heighway said the next key level to watch is $1.35. If the euro falls below that, who knows how much more it will drop? "Uncertainty is the word of the year. I hate to beat it to death. But it's impossible to say what's next," Heighway said. ( Demand and Surprise decrease Equilibrium)