Why would a group of companies be willing to cooperate in price-fixing?

Companies may be willing to participate in price fixing in order to maintain the price of goods or services at a given level. They may be willing to do this in order to avoid competing particularly when their products are similar and competition will likely increase marketing costs and lower profitability for all

so that they could all make more money just did the quiz got it right

Explanation:

what are the choices?

i think it's a)sparta