answer; purpose nondisclosure;
i would say iii (3) because in order to compare a price you have to use as a reference other near stores because it's its
hope i explained myself
the answer would be voluntary exchange -
"the act of buyers and sellers freely and willingly engaging in market transactions. moreover, transactions are made in such a way that both the buyer and the seller are better off after the exchange than before it occurred."
hope this : )