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The empirical core of Piketty’s book is about the distribution of income as revealed by tax records in a handful of rich countries—mainly France and Britain but also the United States, Canada, Germany, Japan, Sweden, and some others. Its virtues lie in permitting a long view and in giving detailed attention to the income of elite groups, which other approaches to distribution often miss.

Early on, Piketty makes a claim to be the sole living heir of Simon Kuznets, the great midcentury scholar of inequalities. He writes: Oddly, no one has ever systematically pursued Kuznets’s work, no doubt in part because the historical and statistical study of tax records falls into a sort of academic no-man’s land, too historical for economists and too economistic for historians. That is a pity, because the dynamics of income inequality can only be studied in a long-run perspective, which is possible only if one makes use of tax records. The statement is incorrect. Tax records are not the only available source of good inequality data. In research over twenty years, this reviewer has used payroll records to measure the long-run evolution of inequalities; in a paper published back in 1999, Thomas Ferguson and I tracked such measures for the United States to 1920—and we found roughly the same pattern as Piketty finds now.

Under President Reagan, changes to U.S. tax law encouraged higher pay to corporate executives, the use of stock options, and (indirectly) the splitting of new technology firms into separately capitalized enterprises, which would eventually include Intel, Apple, Oracle, Microsoft, and the rest. Now, top incomes are no longer fixed salaries but instead closely track the stock market. This is the simple result of concentrated ownership, the flux in asset prices, and the use of capital funds for executive pay. During the tech boom, the correspondence between changing income inequality and the NASDAQ was exact, as Travis Hale and I show in a paper just published in the World Economic Review.

The lay reader will not be surprised. Academics, though, have to contend with the conventionally dominant work of (among others) Claudia Goldin and Lawrence Katz, who argue that the pattern of changing income inequalities in America is the result of a “race between education and technology” when it comes to wages, with first one in the lead and then the other. (When education leads, inequality supposedly falls, and vice versa.) Piketty pays deference to this claim but he adds no evidence in favor, and his facts contradict it. The reality is that wage structures change far less than profit-based incomes, and most of increasing inequality comes from an increasing flow of profit income to the very rich.

It is a book mainly about the valuation placed on tangible and financial assets, the distribution of those assets through time, and the inheritance of wealth from one generation to the next. Why is this interesting? Adam Smith wrote the definitive one-sentence treatment: “Wealth, as Mr. Hobbes says, is power.” Private financial valuation measures power, including political power, even if the holder plays no active economic role. Absentee landlords and the Koch brothers have power of this type. Piketty calls it “patrimonial capitalism”—in other words, not the real thing.

With this passage he makes a distinction that he previously blurred: between wealth justified by “social utility” and the other kind. It is the old distinction between “profit” and “rent.” But Piketty has removed our ability to use the word “capital” in this normal sense, to refer to the factor input that yields a profit in the “productive” sector, and to distinguish it from the source of income of the “rentier.”

Piketty’s further policy views come in two chapters to which the reader is bound to arrive, after almost five hundred pages, a bit worn out. These reveal him to be neither radical nor neoliberal, nor even distinctively European. Despite having made some disparaging remarks early on about the savagery of the United States, it turns out that Thomas Piketty is a garden-variety social welfare democrat in the mold, largely, of the American New Deal.

But would it work to go back to that system now? Alas, it would not. By the 1960s and ’70s, those top marginal tax rates were loophole-ridden. Corporate chiefs could compensate for low salaries with big perks. The rates were hated most by the small numbers who earned large sums with (mostly) honest work and had to pay them: sports stars, movie actors, performers, marquee authors, and so forth.

If the heart of the problem is a rate of return on private assets that is too high, the better solution is to lower that rate of return. How? Raise minimum wages! That lowers the return on capital that relies on low-wage labor. Support unions! Tax corporate profits and personal capital gains, including dividends! Lower the interest rate actually required of businesses! Do this by creating new public and cooperative lenders to replace today’s zombie mega-banks. And if one is concerned about the monopoly rights granted by law and trade agreements to Big Pharma, Big Media, lawyers, doctors, and so forth, there is always the possibility (as Dean Baker reminds us) of introducing more competition.

In sum, Capital in the Twenty-First Century is a weighty book, replete with good information on the flows of income, transfers of wealth, and the distribution of financial resources in some of the world’s wealthiest countries. Piketty rightly argues, from the beginning, that good economics must begin—or at least include—a meticulous examination of the facts. Yet he does not provide a very sound guide to policy. And despite its great ambitions, his book is not the accomplished work of high theory that its title, length, and reception (so far) suggest.