Investor beware. Three major "tail risks" to the global economy pose a potential threat to investments in commodities and other assets, according to an economist and commodity strategist at a major investment bank. Daniel Ahn of Citigroup says these tail risks -- events with a fairly low probability but big consequences -- are an escalation of geopolitical tensions, another flare-up of the eurozone debt crisis and a possible "hard landing" for the Chinese economy.
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