The S&P 500 just had its worst first half in more than 50 years, which ‘stressed’ this classic investment strategy
Stock trader on the floor of the New York Stock Exchange. Spencer Platt | Getty Images News | Getty Images The S&P 500 Index, a barometer of U.S. stocks, just had its worst first half of the year going back over 50 years. The index fell 20.6% in the past six months, from its high-water …