Douglas Rushkoff's new book, "Survival of the Richest: Escape Fantasies of the Tech Billionaires," opens with a surreal scene: For a fee equal to one-third of his annual salary as a professor, Rushkoff flies to a luxurious resort to advise five ultrawealthy men on how to survive the collapse of civilization. More terrifying than the men's Hollywood-derived nightmares is their naive and profoundly antisocial response: They'd rather optimize their bunkers than work to avert the apocalypse. While few have the means to indulge dystopian fantasies so lavishly, the men are an extreme instance of a broader trend. Bunker sales in America are soaring, and the market now caters to a range of income levels, from $40,000 starter bunkers to a nearly $10 million Luxury Series "Aristocrat" that offers a pool and a bowling lane. Many people now seem fixated on stockpiling enough money to protect themselves from the rest of the world, rather than considering the sort of world they are creating by making money in these ways. Rushkoff ... calls this dynamic the "Insulation Equation." Anyone who asks some version of the question " can I earn enough money doing X to insulate myself from the effects of doing X " is considering the Insulation Equation. The Insulation Equation is a provocative and illuminating concept, and Rushkoff devotes much of the book to tracing the manifestations and origins of a mind-set that seduces people into believing they can insulate themselves from harms they help create.