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No matter their strengths, businesses, like people, are always at risk. Some dangers are so blatant they dare being ignored. But others, far less obvious, cause untold — and even fatal— damage, eating away and undermining a company’s best efforts. Their work is insidious and relentless, going unnoticed until it’s too late. And it all happens without anyone breaking a sweat.

Even so, there are clear, but unseen, indicators that a business is in trouble. Here are nine to consider.