Economic Definition of luxury good. Defined.
Offline Version: PDF
Term luxury good Definition: In general, a good (or service) that is not essential but makes like more enjoyable. Luxury goods are often more expensive and primarily purchased by people with more wealth and income. Using more precise, technical language, a luxury good exists if the income elasticity of demand is positive and greater than one. In other words, as people receive more income, they devote an increasingly larger share of income to the purchase of luxury goods.