1. Productive relative to the cost
   - cost-effective

See also: efficient

• ethnocentrism
• ethnographer
• ethnographic
• ethnographical
• ethnographically
• ethnography
• ethnolinguistics
• ethnologic
• ethnological
• ethnologically
• ethnologist
• ethnology
• ethnomusicology
• ethnos
• Ethocaine
• ethologist
• ethology
• ethos
• ethosuximide
• ethoxyethane
• Ethrane
• Ethril
• ethyl
• ethyl acetate
• ethyl alcohol