Answer:
The correct answers would be Oligopoly, Do the Same. Because Southwest Airlines operates in an Oligopoly, If American Airlines lowers prices, Southwest will likely Do the same.
Step-by-step explanation:
Oligopoly is a market structure in which there are few producers or sellers of the same product. Common examples of businesses in oligopoly include Automobile industry, Airline Industry, Telecom industry, etc. So in this type of market structure, when one company lowers the prices of the products, the other companies have to do the same, otherwise customers will go to get the product from the producer who is selling it at a cheaper price.