Everybodyhatesit，buteverybodydoesit．Arecentreportsaidth...
問題詳情：Everybodyhatesit，buteverybodydoesit．Arecentreportsaidthat40％ofAmericanshatetipping．Butwhydotipsexist? Thecommonopinioninthepastwasthattipsbothrewardedtheeffortsofgoodserviceandreduceduncomfor...