Abstract:
This paper examines the impact of employment density (agglomeration) on the hourly earnings of workers across districts of Great Britain. The potentially two-way causality between agglomeration and productivity is dealt with using two instruments: the total land area of a district and its population density. The estimated agglomeration effect is similar across different levels of territorial aggregation; however, the effect is stronger when looking only across Metropolitan areas. There is evidence of endogeneity only when the sample is split into Metropolitan and Non-Metropolitan areas and even so endogeneity has only little effect on the estimates.