00334nam a2200109Ia 4500008004100000245008700041260004800128260000900176300000900185500001400194650001600208170224s9999    xx            000 0 und d  aSocial norms and rank-based nudging: Changing willingness to pay for healthy food.  bJournal of Experimental Psychology: Applied  c2015  a21:3  aSeptember  xPsychology.