This paper explores the relationship between productivity and labour density at the municipality level for the Spanish economy and year 2001. Previous results on the mentioned relationship are confirrmed. Whilst agglomeration e¤ects at NUTs-3 level were important along the 1960s and 1970s, they...

This paper proposes two considerations prior to the study of city size and emphasizes their importance in the testing of one of the empirical regularities most widely used by the literature, Zipf’s law. The first one refers to the importance of using a consistent database for analysis. The...