The decades after World War II were a golden age across much of the world. It was a time of economic miracles, an era when steady jobs were easy to find and families could see their living standards improving year after year. And then, around 1973, the good times vanished. The world economy slumped badly, then settled into the slow, erratic growth that had been the norm before the war. The result was an era of anxiety, uncertainty, and political extremism that we are still grappling with today.