Fact checked by Stella Osoba In 2007, Warren Buffett made a bold statement about the investment management industry that would lead to one of the most instructive wagers in financial history. His million-dollar bet not only demonstrated the power of simple investment strategies but also exposed fundamental truths about investment costs and market

Warren Buffett is a money man -- in multiple ways. While his Berkshire Hathaway operates in a wide range of sectors, it's categorized in the financial services sector because of its huge insurance businesses.

Since launching a new stake in the U.S. oil producer Occidental Petroleum ( OXY -2.09%), Berkshire has bought the stock like there is no tomorrow. Occidental is the sixth-largest position in Berkshire's portfolio, and Berkshire now owns over 28% of outstanding shares.

While it won't make you a billionaire overnight, following these 5 principles can lead to better long-term investments.

Buffett invested in Heinz in 2013 and two years later, Heinz merged with Kraft Foods. He bought 326 million shares during this merger at a cost of around $24.6 billion. He has held on to that stake, which is now worth $11.4 billion.