 Other scholars have built upon Piketty's work, such as historian Walter Scheidel, who concurs with Piketty in his own study of inequality ("The Great Leveler", 2017) that the gap will continue to widen as the decades pass, but contends that Piketty's solutions are untenable.Paul Krugman called the book a "magnificent, sweeping meditation on inequality" and "the most important economics book of the year—and maybe of the decade.