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Last Month’s Index
[ May 2014 ]

Harper’s Index

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Estimated additional hours Americans would spend stoned annually if marijuana were legal in most states

: 30,000,000,000
May 2014 • Source: Jonathan P. Caulkins (Pittsburgh)

Factor by which a placebo for Parkinson’s disease is more effective when the patient is told it costs $1,500 rather than $100

: 2
May 2014 • Source: Alberto Espay, University of Cincinnati
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