adsadvertisingappliedapplyauthoravoidbecomebehaviourbehaviouralbehindbiasbookboostcategorycoconsumercostcreatecustomerdevicesdrivedysoneffecteffectiveeffortencourageendexpectationexpectationsfluentformerfrictiongrowhabitsharnessedharnesseshelpedhiddenhookedillusioninterviewkeylessonslisteningmakemakesmangermarketmemorablemessengermilknostalgiapeakphilpowerpretprincipleprofessorpsychologypublicqualityresearchrewardsrulesalesscarcitysharesignalspotifysuccesssuccessfultastethreeuseusedusesusingwayworldyear