Brad DeLong at the Washington Center for Equitable Growth:
Ryan Avent: Inequality: “Capital” and its discontents: “Piketty’s magnum opus is certainly not without its weaknesses…DeLong highlighting Avent commenting on Crook's review of Piketty.
but the quality of the criticism it has attracted provides a sense of the strength of the argument he makes. Consider Clive Crook…. He writes:
There’s a persistent tension between the limits of the data he presents and the grandiosity of the conclusions he draws.The line doubles as a pleasingly apt description of Mr Crook’s review. He is unhappy…. Why… doesn’t Mr Piketty say that r must be significantly above g to generate the expected divergence, Mr Crook complains…. You don’t even have to read hundreds of pages to get the qualification Mr Crook wants; you can start with the page on which r>g is first mentioned…. Mr Crook then goes on to present his evidence: “The trouble is… capital-to-output ratios in Britain and France in the 18th and 19th centuries… were stable”…. Piketty is not arguing that r>g means that rising inequality is inevitable. Indeed, that is close to the precise opposite of his argument, which is that r>g is a force for divergence… which has at times been countered… and which can and should be similarly countered in future. Presumably, if charts of stable capital-income ratios in the 19th century provided a devastating rebuttal to his story, Mr Piketty would not have included them so prominently in the book. I think he must have imagined that readers would look at the text around them as well…
