The report linked below from Bloomberg Businessweek illustrates one of the fundamental difficulties in policymaking--achieving desired outcomes even when all desired outputs have been met. According to the report, efforts to ban sodas from schools have been effective in achieving the desired output of there being fewer sugary beverages available to students during school hours; however, the policy has not made any progress towards achieving its desired outcome of reduced soft drink consumption, as kids have been able to drink other sugary beverages like energy drinks as a replacement, or go off-campus to find the sodas that they want.
http://www.businessweek.com/news/2011-11-07/banning-sugary-soda-from-schools-fails-to-cut-teen-consumption.html
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