Price-fixing groups are organizations that work together to control the prices of goods and services. The two most common types of price-fixing groups are trusts and CARTELS. Trusts are formed when a group of companies join together to limit competition and control prices. CARTELS are similar to trusts, but they are usually formed by countries or governments to control the prices of commodities. Both trusts and CARTELS are illegal in many countries, as they can lead to higher prices for consumers.