There are few better investments a company can make than in their own workers' happiness and engagement, writes Cindy Krischer Goodman. A recent study found that firms with high levels of worker happiness outperformed the broader stock market by an average of 19%, suggesting that cultivating a cheery workplace can help companies gain a key competitive advantage. "The companies expanding, taking over competitors and shaping their industries are those with happy workers," Goodman writes.

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