How much is too much—or rather, how much is never enough? Such is the question for the billionaires who now make up the country’s ultrarich. Their giant yachts, luxury compounds—and, oh yes, tax schemes—are a source of endless, if alarming, fascination. It is the question tackled by The New Yorker staff writer EVAN OSNOS in his new, deliciously readable collection of essays. He will talk about the book and the acquisitive appetites and habits of our new “oligarchs” and how their outsized fortunes are allowing them to hold sway over the elections and the economy.