Some practices are deemed by the courts to be so obviously detrimental that they are categorized as being automatically unlawful, or illegal
per se. The simplest and central case of this is
price fixing. This involves an agreement by businesses to set the price or
consideration of a good or service which they buy or sell from others at a specific level. If the agreement is durable, the general term for these businesses is a
cartel. It is irrelevant whether or not the businesses succeed in increasing their profits, or whether together they reach the level of having
market power as might a
monopoly. Such collusion is illegal
per se.