U.S. retail sales slipped 0.2% in May. That’s the biggest monthly fall in two years, although quite a bit of the drop last month was due to a sharp decline in gasoline sales. Nonetheless, the revised data tell us that retail sales have fallen for two months in a row—the first back-to-back monthly declines since 2010. Looking at retail sales on a year-over-year basis is more encouraging, but the trend is still slipping on this front too.