“…Lucas (1988) argues that cities are the preferred unit of analysis when human capital (and associated externalities) may be an important component of the growth process. For instance, Drennan (2005), Glaeser and Saiz (2004), Simon and Nardinelli (2002), Simon (1998), Glaeser, Scheinkman, and Shleifer (1995), Crihfield and Panggabean (1995) and Rauch (1993) examine determinants of growth for metropolitan areas (and cities) and find that human capital has a powerful impact on economic performance, as measured by population, employment, and income growth, as well as on productivity. These studies also examine a variety of influences on metropolitan growth, including industry mix, amenities, race, and geography, as well as manufacturing and public capital investment.…”