【答案解析】Top universities once benefited from having clusters of star professors. But the strong relationship between individual output and that of one's colleagues weakened in the 1980s, and vanished by the end of the 1990s. The internet, and particularly blogs, have exemplified the faster flow of information and the waning importance of location. So it is now easier for economists from any university to have access to the best brains in their field. Now, anyone with an internet connection can sit in on a virtual lecture from renowned economists. Their ideas move freely beyond the geographical location of their universities.