In competition economics, quality and prices of products and services are equally in focus. Quality effects are more difficult to measure than price effects. Quality is a subjective concept that each respondent perceives differently. 

Economic logic is that consumers are influenced by both price and quality considerations in their purchasing decisions. The perception of quality is the value or benefit that consumers derive from a product or service. Possible indicators for measuring quality are attributes associated with a specific product or service.

EE&MC uses qualitative and quantitative tools such as customer surveys to determine the effects of quality changes. In particular for defining relevant product markets in the digital economy the attribute "quality" is a necessary element.