which reproduces the basic structure of the regression equations used by Hall and Jones (1999), Acemoglu et al. (2001), Easterly and Levine (2003), and Rodrik et al. (2004). By implicitly imposing a cross-country restriction on the capital–output ratio rather than on the technology term, these studies reproduce the non-parametric accounting result of KRC with a parametric methodology, namely that international differences in a broad concept of technology account for international differences in output per worker. Notwithstanding all sorts of empirical estimation problems, it appears that this result is much closer to the basic message of the Solow model than the results presented by MRW.