“This,” he declares, after listing the frequent market eruptions of the past three decades, “is historically very anomalous. There was one bubble in the 1920s and one in the 1720s.” Now the 46-year-old Facebook billionaire, former hedge fund star and self-styled libertarian Big Thinker is ready to declare one final bubble. This time it is the result of excessive government borrowing to refloat a world struggling to get beyond the financial crisis. With this, he argues, we have arrived at the Last Bubble. There will be no more. Period.