The possibility of political catastrophe looms close on the horizon in Greece and everyone is talking about a possible "Grexit."

Outside of Greece, the real problem here is the risk of contagion—a wave of fear and capital flight that could jeopardize the stability of the eurozone.

Societe Generale provides this handy guide to everything that could go wrong if a country were to leave the euro:

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euro break up contagion checklist

Societe Generale