Because they've been told that it does. There's no such thing as an informed supply-sider.
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Edited by Quantum: 8/15/2013 7:58:58 AMI think that may be[i] too generalized[/i], as a sizable portion of the world's economists are supply side economists. That, and modern economic theory is a combination of microeconomics set up back Hayek, and Keynesian economics, in most Western countries. DGSE models, for starters. Although I do agree that 99% of the "supply siders" on the internet don't really understand how the system works, which is especially ironic when a libertarian like HM Rob says it. (Even Hayek himself admitted that the government had some role to play in economics.)