N.B.: This working paper is the preprint for:
"Growth Econometrics," 2005, Paul Johnson, Steven Durlauf, and Jonathan Temple, <em>Handbook of Economic Growth</em>, edited by P. Aghion and S.N. Durlauf, North-Holland: Elsevier. <a href="https://doi.org/10.1016/S1574-0684(05)01008-7" target="_blank" title="Persistent link using digital object identifier">https://doi.org/10.1016/S1574-0684(05)01008-7</a>