What term describes the act of two or more businesses colluding to reduce competition against another business?

The term that best describes the act of two or more businesses colluding to reduce competition against another business is "business collusion." This concept refers to any agreement between rivals that aims to limit competition, manipulate market conditions, or coordinate actions to achieve mutual benefits at the expense of consumers or competitors.

Business collusion can manifest in various forms, such as price-fixing, where companies agree to set prices at a certain level instead of letting market forces dictate them. Market sharing involves dividing up markets or customers among businesses to avoid competing with one another.

While the other terms can describe related behaviors or tactics within the broader context of collusion, "business collusion" is the most general and comprehensive term that captures the essence of the act itself, emphasizing the collaborative nature of the businesses involved in limiting competition.