In this newly published article, two Dutch researchers, Roel Rutten and John Gelissen, test the creative class theory for Europe and find it holds. I especially like the last line.

[W]e test the creativity and diversity hypothesis of Richard Florida for European regions. Florida argues that the level of regional economic development depends on the levels of technology, talent, and tolerance that regions harbour. Tolerance, in this case, is a measure for diversity of lifestyles, the creativity that results from it and population’s openness towards non-traditional lifestyles. Using data for 94 European regions we investigate whether differences in creativity and diversity are a good predictor of differences in regional wealth in additive and multiplicative regression models. The results indicate that regional differences in diversity are directly related to differences in regional wealth. Moreover, we find that the synergetic effect of technology and talent on the level of regional wealth depends on the degree of diversity that resides within regions. Our findings support the idea that creativity and diversity deserve a more prominent place in economic geography.