Joanna Poyago-theotoky La Trobe University   La Trobe University La Trobe University Melbourne, Victoria 3086 Australia   j.poyago-theotoky@latrobe.edu.au   http://ideas.repec.org/e/ppo17.html           JEL Areas: O3 : Technological Change; Research and Development: General D0 : Microeconomics: General