The Stock Warren Buffett Spent $78 Billion Buying Over the Last 7 Years Is Slumping, and It Begs the Question: Has the Oracle of Omaha Lost His Touch?

Berkshire Hathaway's (BRK.A 0.07%) (BRK.B 0.72%) billionaire CEO Warren Buffett is widely viewed as Wall Street's greatest money manager. Without relying on fancy charting software or algorithms, the aptly named Oracle of Omaha became one of the richest people in the world and watched Berkshire grow into one of only 11 public companies worldwide to ever hit a $1 trillion valuation.