See also the publication in <A href="http://onlinelibrary.wiley.com/doi/10.1111/j.1467-6419.2012.00723.x/abstract">'Journal of Economic Surveys'</A>, 26(3), 468-91.<p>Empirical studies in spatial economics have shown that agglomeration economies may be a source of the uneven distribution of economic activities and economic growth across cities and regions. Both localization and...</p></a>