xBookUtils.terms['fn_3_501'] = "On changing U.S. demographics and their impact on the economy, see Kotlikoff, Laurence J., and Scott Burns. 2004. The Coming Generational Storm. Cambridge, MA: MIT Press.";
xBookUtils.terms['fn_3_502'] = "International Herald Tribune. http://www.iht.com/articles/ap/2007/07/31/business/EU-FIN-MKT-Oil-Prices.php.";
xBookUtils.terms['fn_3_503'] = "Information Resources, Inc. September 16, 2005. Times and Trends.";
xBookUtils.terms['fn_3_504'] = "Paleontological Research Institution. http://www.priweb.org/ed/pgws/history/spindletop/lucas_gusher.html.";
xBookUtils.terms['fn_3_505'] = "See information available at the U.S. Energy Information Administration Web site. http://www.eia.gov/.";
xBookUtils.terms['fn_3_506'] = "On the costs of oil production, see Joint Economic Committee, United States Congress. OPEC and the High Price of Oil. http://www.jec.senate.gov/republicans/public/?a=Files.Serve&File_id=3e2039d7-caa3-428c-ac2e-1b87f811e723.";
xBookUtils.terms['fn_3_507'] = "It is equally correct to think of new entrants as shifting the supply curve down. Remember, it’s ultimately costs that shift supply, and what increases supply is entry of lower-cost producers. Industry costs fell when Canadian producers entered the market because many Canadian producers had lower costs than some U.S. producers. As lower-cost Canadian producers entered the industry, higher-cost U.S. producers exited the industry, and industry costs decreased, thus shifting the supply curve down.";