Answer:
d. A cartel agreement is not affected at all by the $10 principle.
Step-by-step explanation:
Cartel agreement is a legal setup in which companies having common interest unite and form a cartel. The companies together form an oligopoly setup and then competition among them is minimum. The $10 principle does not affect a cartel. They all work together to protect each others interest. Cartels can fix prices for their members to minimize the competition over price.