India, June 4 -- At Berkshire Hathaway's annual meeting last month, Warren Buffett confirmed he will step down as chief executive at year-end and hand the reins to vice chairman Greg Abel. "I think the time has arrived where Greg should become the chief executive officer of the company at year-end. And I want to spring that on the directors, effectively, and give that as my recommendation," he said. A month later, markets have largely absorbed the announcement. What remains compelling is how a once-struggling textile company evolved into a investment powerhouse valued at more than $1 trillion, and how Buffett's returns have stacked up against broader market benchmarks. Equally intriguing is what makes his investment approach uniquely succ...