Pick a Number, Any Number

In the divorce trial of oil billionaire Harold G. Hamm, CEO and founder of Continental Resources, his lawyers claimed that he was responsible for less than 10 percent of his personal and corporate success. His performance, they argued, was due to luck in the form of favorable global oil prices and other circumstances outside his control. His wife's lawyers countered that his leadership skill and hard work accounted for 90 percent of his performance and, therefore, his fortune. A judge's ruling in November 2014 sided with Mr. Hamm.