the best piece I have seen on these issues is in Regulation. Here
http://www.cato.org/pubs/regulation/regv24n1/coate.pdf
Alex
--
Alexander Tabarrok
Department of Economics, MSN 1D3
George Mason University
Fairfax, VA, 22030
Tel. 703-993-2314
Web Page: http://mason.gmu.edu/~atabarro/
and
Director of Research
The Independent Institute
100 Swan Way
Oakland, CA, 94621
Tel. 510-632-1366
