 well i'll tell you i really benefited from my interactions with milton and rose friedman i remember the first time i i went to friedman uh... and knocked on his door i'd set up an appointment with him when i was writing a book on uh... friedrich hayek who'd been a colleague of his at the university of chicago i asked him if i could interview him he said sure come on up and the first thing i asked friedman was do you mind if i tape the conversation and he said to me i remembered it to this day he said i have a single rule