we talk about this in our book, the johnstown city tax, johnstown, pennsylvania, back in the '50s it was decimated by a flood and so pennsylvania said, okay, we're going to put a tax on alcohol and the proceeds from this tax will rebuild johnstown after the flood. and, of course, the tax generated lots of money and rebuilt johnstown, but once johnstown was rebuilt, the tax didn't go away. we still have the tax today. in fact, to date, pennsylvania has collected enough revenue from that tax to rebuild johnstown six times over, and the tax will not go away because once government gets a tax, it likes to hang onto it. >> professor davies, you write in your book, the essence of government is force. >> yeah, the essence of government is force. when we wrote this book, what motivated it was we looked back through history and what we notice is any time humans come together to do anything, they organize themselves either according to principles of cooperation or principles of coercion. and principles of cooperation means you come together voluntarily and you do something, if things work out