Even considering that, the 3% figure still seems wildly implausible. This would require something like 90% of the population thinking they pay 0% taxes, and the remaining 10% thinking they pay 30% taxes (which is still an underestimate).
The PDF that Louie linked to doesn’t explain what the numbers mean. Surely there would be lots of articles about this epidemic of grossly underestimating taxes. Can anyone provide more evidence?
CiteULike is quite nice for this.
Connotea is a similar “personal research library” service but it doesn’t let you store PDFs, just links to articles.