“I think overall it’s a disadvantage,” Jeb Bush once said of what it meant for his business career that he was the son of an American president and the brother of an American president and the grandson of a wealthy Wall Street banker and US senator. When he ran for governor of Florida, he repeatedly referred to himself as a “self-made man,” and it is a measure of how deeply we associate success with the efforts of the individual that few batted an eye at that description.