Beware the 'perfect storm of negative events' one expert says will send stocks crashing

Optimism is creeping back into the stock market amid expectations of trade-war progress, and as analysts across Wall Street prime investors for strong second-half earnings.
Vincent Deluard, a macro strategist at INTL FCStone, says investors should avoid being swept up in what could be a strong summer, and instead focus on a troubling combination of factors that could wreak havoc in the fall.
He outlines four main headwinds that could strike the market simultaneously.
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