Arnold set out to discover why Buffett chose the companies he invested in and what lessons individual investors can learn from Buffett’s decisions. Volume 1 of The Deals of Warren Buffett (Harriman House, 2017) covers the period leading to Buffett’s first $100 million in net worth, which he reached in 1978 at the age of 48....Throughout, Arnold stresses Buffett’s investing principles, exemplified in each of these deals, that can withstand the test of time. Among them: Grand principles are more important than a grand plan. Market moods can be incomprehensible to value investors, but stick with sound investing principles in good times and bad. And, re managers, good jockeys will do well on good horses, but not on broken-down nags. And so, in general it’s important to avoid businesses with problems.