Tuhia he whiti kōrero poto i runga i te kaupapa e whai ake nei:  Ka hokona e te tangata X ki te tangata Z
Ae ra, anei he rarangi poto: He kapu a Keeton i hokona e ia i Walmart mo te $4 hei hoko atu. Ka hokona e Keeton te kapu ki te tangata Z mō te $5.