The marketing mix is a business tool used by marketers to determine a product or brand's offer. It is often associated with the four P's of marketing: product, price, promotion, and place. For services, the four P's were expanded to the seven P's to address the different nature of services. The seven P's model adds physical evidence, people, and process. The marketing mix helps marketers decide how to position products, exploit brands, and configure product lines to complement each other.