Does this sound familiar: Smart guy owns a stock in March at $200, sells it in June at around $600, but then buys it back in July and August for between $900 and $1,000. By September it’s back at $200. That was Sir Isaac Newton getting pulled into the great momentum trade of the South Sea Co., which cratered 300 years ago this month. He lost the equivalent of more than $3 million today. Newton, whose second law of motion is about the momentum of a body equaling the force acting on it, didn’t know that works for stocks too.

Source: Wall Street Journal September 13, 2020 16:18 UTC