Three of the airline companies agree that they will not go any lower than $100 each way for coast-to-coast tickets. This is:

A) vertical price maintenance.
B) a horizontal group boycott.
C) vertical market allocation.
D) horizontal price fixing.

Horizontal Price Fixing

An illegal agreement between competitors to fix, control, or maintain prices at a certain level, often leading to reduced competition.

Airline Companies

Businesses that provide air transport services for traveling passengers and freight.

Tickets

Documents or electronic codes that grant the holder a right to enter a venue, travel on a vehicle, or participate in an event.