This dissertation proposes three empirical essays focusing on the importance of geographical concentrations along various dimensions in regional economics, dealing with topics regarding agglomeration spillovers, firm performance, culture and soft institutions as well as the geographical concentration of political ideologies. The first chapter aims at empirically verifying whether agglomeration spillovers affect a particular indicator of firm performance, namely firm solvency, which, in turn, determines firms’ ability to borrow. The results show that agglomeration mechanisms shape firm’s credit accessibility, along with the characteristics of the firm itself and geographical information. As highlighted by the economic literature, this ...