Famed investor Sir John Templeton is credited with saying the four most dangerous words in investing are "this time it's different." It's an acknowledgement that there seem to be fundamental laws with respect to risk and return that can bend for a while but do not ultimately break.

For the past few years, the market has been full of stocks that are close to buckling many long-held beliefs. Home Depot (NYSE: HD), Context Logic (NASDAQ: WISH), and Tesla (NASDAQ: TSLA) are three companies with their own unique stories. But shareholders in each are hoping that the old adage rings false. And it truly is different this time. Here's why.

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Source Fool.com