A classic and widely touted investment strategy looks poised to deliver meager returns for investors in the coming years. Forecasters at Bank of America said they think the classic 60/40 portfolio — an investment portfolio split between 60% stocks and 40% bonds — was likely headed for a yearslong stretch of weak performance. The bank predicted the classic portfolio mix would return less than 1% next year after accounting for inflation, and that the portfolio would deliver a real loss of 0.1% over the next ...