 D.A. Davison on Friday said stocks in the SPDR SP Retail ETF XRT, 0.33 tend to underperform during the period from Black Friday to the end of the year. On average, the SPDR SP Retail ETF has fallen 0.1 since 2010 during this period which amounts to 180 basis points of underperformance compared to the SP 500 SPX, 0.59. 