The stock market started to rotate out of LargeCaps and into SMidCaps after June's CPI was released on July 11 (chart). It showed lower-than-expected inflation, which increased the odds that the Fed would start cutting the federal funds rate (FFR) in September and triggered the rotation because small companies tend to depend more on floating-rate debt than large ones. Easier monetary policy would also reduce the likelihood of a recession, benefitting small companies more than large ones which can survive downturns more easily.
