SummaryA series of SA articles by Harry Long and Frank Grossmann discuss strategies that combine 20+ Year Treasury Bond ETFs with the S&P 500.SPY/TLT and SPXL/TMF strategies perform well because TLT and TMF are positive alpha funds, not because they are negatively correlated with the market.Negative correlation in the absence of positive alpha doesn't do you much good in portfolio optimization.The
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