My research finds strong evidence that the majority of large companies do not successfully maintain their current revenue streams, let alone grow them over time. My “growth outliers” project looked at publicly traded firms with market capitalizations of greater than US 1 Billion as of 2009, using data from Capital IQ.  I found that in the period from 2000 to 2009, over half of the firms in the sample shrunk their revenue by 10% or more in at least one of those years, clear evidence of eroding competitive advantage.