@jakeclaverqfop: Berkshire Hathaway could buy almost the entire S&P 500 in cash. With its war chest, Berkshire could buy nearly every company in the index outright, all of them except the top five or ten names. Think the handful of mega-cap giants. That single fact tells you how concentrated the market's value has become. A few stocks are worth more than hundreds of others combined. Does that concentration worry you?