Ortega explains not only what Piketty forgot, but provides a good summary of his thesis in Piketty's important tome entitled Capital in the Twenty-First Century.
Exactingly empirical and deeply multidisciplinary, [Capital in the Twenty-First Century] is an extremely important contribution to the study of economics and inequality over the last few centuries. But because it fails to address the real limits on growth—namely our ecological crisis—it can’t be a roadmap for the next.