Key PointsOver the past 50 years, times when consumer sentiment hit historic lows correlated with bear markets, recessions, and high interest rates.Today, the S&P 500 is hitting new all-time highs while sentiment is hitting lows.Historically, when consumer sentiment hits lows, it acts as a "buy low" signal followed by double-digit gains for the S&P 500.10 stocks we like better than Vanguard S&P 500 ETF › For much of the past two years, consumer …