Three large firms dominate the telecommunication industry of United Canava: AD Telecom Inc., Mystic Telecom Corp., and Total Talk Inc. Instead of cutting prices competitively, these firms have resorted to non-price competition through branding and product differentiation. Which of the following industry competitive structures are these companies most likely in?
a. monopolyb. perfect competitionc. monopolistic competitiond. oligopoly

Consider the market for gas-powered small cars. assume gas-powered small cars are a normal good. for each of the following events, identify which of the determinants of demand or supply are affected. if demand is unaffected by this event because it creates only a supply change, select the “none” option under the “demand determinant” column. similarly, if supply is unaffected by this event because it creates only a demand change, select the “none” option under the “supply determinant” column. event demand determinant supply determinant people decide to have more children. the price of electric small cars falls. the discovery of a new source of iron ore lowers steel prices. an economic recession lowers people’s wealth. a number of major car dealers decide to switch from selling gas-powered cars to selling electric cars. show the effect of the following event on the market for gas-powered small cars: people decide to have more children for each of the four independent situations, prepare the journal entries to record the exchange on the books of each company.