the johnstown city tax, this is johnstown pennsylvania in the 50s. it was decimated by a flood pennsylvania said okay, were going to quit put attacks on alcohol and the proceeds will rebuild johnstown for the flood and of course contacts generated lots of money and read thejohnstown once johnstown was rebuilt the tax didn't go away . in fact, today pennsylvania has collected enough revenue on that tax to rebuild nonstandard six times over and the tax will not go away because once government gets attacks likes to hang on to it. >> professor davies, you write in your book the essence of government is force. >> the essence of government is force. when we wrote this book what motivated it was we look back through history andwhat we noticed is anytime humans come together to do anything , they organize themselves either according to principles of cooperation or principles of coercion and principles of cooperation mean you come together voluntarily and you do something and things work out, that's great. if they don't you're free to walk away. everything go