Which of the following is correct about double coincidence of wants a- economy with money use this system exchange between 2 people where 2 people each want one good or service that the other person can provide b- economy without money use this system exhange between 4 or more people, wher these people each want one  good or service that the rest people can provide c- economy without money use this system exchange between 2 people where 2 people each want one good or service that the other person can provide. d- money acts as an intermediary between the buyer and the seller. seller would pprovide good/service. and get paid in money

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