【单选题】Three airlines account for most of the air traffic in and out of a local city. If the three airlines joined together in setting fares and air travel schedules, economists would say that they were acti...
A.
monopolistic competitors, as each firm would have to differentiate its airline services from its rivals.
B.
perfect competitors, as each firm would sell travel services at the same fares as the other airlines.
C.
a cartel, as the three airlines together would attempt to coordinate policies in the local market to jointly maximize profits.
【简答题】Our class usually begins at 10 o'clock, but yesterday it _______ (begin) at 10:30.2. My roommate often comes home around midnight, but last night he _______ (come) home at 3 a.m.3. I almost always do ...