Before my last lecture, which will begin in less than half an hour, I started cleaning one of my filing cabinets. I threw away many files that have been gathering dust for years. One of these, counting at least five-hundred pages, contained typewritten notes written from 1972 to 1975 during my doctoral studies at MIT. My first dissertation topic, which was abandoned after about a year, was regional economic development in Yugoslavia—an incendiary topic at the time of growing nationalism from all sides. Finding now this and now that of interest among the yellowing pages, I pulled the file out of the dustbin several times, but I ultimately left it there. The dustbin of history.