Agglomeration economies in the Netherlands
The drift to the city has been going on for hundreds of years. As a result, most economic activity is concentrated in small geographical areas. The advantages of proximity of people and firms go under the name 'agglomeration economies'. We regress regional labour productivity on a set of agglomeration indices, and find evidence for a productivity effect of concentration of production with a malus for industrial variety. Thus, the evidence supports Marschall-Arrow-Romer economies. The evidence does not support, however, Jacobs economies, nor variants of the Creative Class Hypothesis.