The document discusses how companies that achieve the top position ("top dog") in their sector tend to underperform relative to other companies in that sector over time. It finds that on average, the top dog in each sector lags the sector average by 3.5% in the following year, 3.9% over 3 years, and 3.3% per year for the next decade. This "too big to succeed" phenomenon may be partly due to increased scrutiny from competitors, politicians, and the public when a company becomes the sector leader. The document also finds some evidence that top dog underperformance is worse during periods of larger government spending and regulation.