That would be the ongoing Bruce Bartlett-Eric Kleefeld discussion about supply-side economics and the tax system, over at Andrew's place. It starts here; the conversation about the benefits and drawbacks of shifting from income to consumption taxes (like Bartlett, I'm a fan) kicks off here.
(And yes, it's a sign that you've been in Washington too long when you refer to yourself as a "fan" of consumption taxes.)
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