What are the economic implications of Greece's decision to leave or stay in the eurozone?
Andrew Balls, of global investment firm Pimco, says the markets are "starting to price-in a disorderly outcome".
"It is more likely than not that Greece will exit the eurozone in coming months, or year or two", he says, but there is "great uncertainty" on whether this will be done in an orderly manner.
Carsten Brzeski, from ING bank in Brussels, believes the EU is not prepared for a euro exit from Greece.
"It will be sheer chaos", he says, "we will see a complete stand-still of the European economy".
EU leaders are "whistling in the dark, it's a game of chicken", he adds.
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