Amarket: a. reflects upsloping demand and downsloping supply curves. b. entails the exchange of goods, but not services. c. is an institution that brings together buyers and sellers. d. always requires face-to-face contact between buyer and seller. 2. markets, viewed from the perspective of the supply and demand model: a. assume many buyers and many sellers of a standardized product. b. assume market power so that buyers and sellers bargain with one another. c. do not exist in the real-world economy. d. are approximated by markets in which a single seller determines price.