Investors are currently reveling in the 'better', as an ongoing eight-month melt-up once again pushed the S&P 500 to fresh highs this week. But sooner or later, the 'worse' will come, warns David Rosenberg, the founder of Rosenberg Research, who famously called the 2008 recession while working as Merrill Lynch's chief economist. AdvertisementAnother sign the market is out over its skis is the performance divergence between the market cap-weight and the equal-weighted S&P 500 indexes. On June 12, the Dow underperformed the S&P 500 by 0.94%, one of only 71 trading days since 1982 where that's happened, according to Rosenberg's technical analysis consultant, Walter Murphy. AdvertisementIn addition to concerning market technicals, fundamentals could also be in a troubling place in the form of labor market weakness, Rosenberg said.

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