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Biotech stocks have been the poster child of relative strength in recent weeks. Relative strength (not to be confused with the Relative Strength Index) measures the performance of a stock or index against a broader benchmark like the S&P 500 index ($SPX.X). Though...
A lot of catalysts are vying for attention after last week's sharp drop, but two earlier trends seem to remain intact. First, health-care stocks enjoyed surprising positive results last earnings season. That made the SPDR Health Care ETF (XLV) the best-performing...