Marcelo E. Alves da Silva Universidade Federal de Pernambuco and PIMES/UFPE   Rua Neto de Mendonça, 170 Ap. 302 Recife, PE 52050-100 Brazil   measilva@gmail.com   https://sites.google.com/site/marceloeasilva/           JEL Areas: O4 : Economic Growth and Aggregate Productivity: General L1 : Market Structure, Firm Strategy, and Market Performance: General