Oligarchy is a form of government where the richest people in a country have captured its political system (or even filled it with themselves) and use that control to direct much of the government’s efforts to increasing their own wealth and power. We’ll soon again have a billionaire president — helped to power by the richest billionaire on the planet — with his election campaign funded in large part by at least $2 billion in direct, reported donations from roughly 150 billionaire families.