The historian of science Steven Shapin famously opened his 1996 study of The Scientific Revolution by declaring, “There was no such thing as the Scientific Revolution, and this is a book about it.” Jacob Soll doesn’t make a similarly bold venture into paradox at the beginning of Free Market: The History of an Idea by asserting that there’s no such thing as a free market, and this is a book about it. But the reader will likely reach that conclusion anyway, for its central theme is that a free market in the abstract, ideal sense has never existed and never can.