Social interactions are considered pivotal to urban agglomeration forces. This study employs a unique dataset on mobile phone calls to examine how social interactions differ across cities and peripheral areas. We first show that geographical distance is highly detrimental to interpersonal...

This paper tests the hypothesis that product market competition has a negative impact on spatial agglomeration. This hypothesis emerges as an interpetation of the models by Combes and Duranton (2001) and Alsleben (2005) which are about firms' location choice in the presence of knowledge...