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  • There are 11 states in the United States that in the last 50 years instituted an income tax. So I looked at each of those 11 states over the last 50 years, and I took their current economic metrics and their metrics for the five years before they put in the progressive income tax... Every single state that introduced a progressive income tax has declined as an overall share of the U.S. economy.

    "How Low Can They Go? Arthur Laffer Defends Slashing State Income Taxes". Interview with Paul Solman, www.pbs.org. August 1, 2013.
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