Luxury goods

In economics, a luxury good is a good for which demand increases more than proportionally as income rises, and is a contrast to a "necessity good", for which demand increases proportionally less than income. Luxury goods are often synonymous with superior goods and Veblen goods.

Luxury goods are said to have high income elasticity of demand: as people become wealthier, they will buy more and more of the luxury good. This also means, however, that should there be a decline in income its demand will drop. Income elasticity of demand is not constant with respect to income, and may change sign at different levels of income. That is to say, a luxury good may become a normal good or even an inferior good at different income levels, e.g. a wealthy person stops buying increasing numbers of luxury cars for his automobile collection to start collecting airplanes (at such an income level, the luxury car would become an inferior good).

Some luxury products have been claimed to be examples of Veblen goods, with a positive price elasticity of demand: for example, making a perfume more expensive can increase its perceived value as a luxury good to such an extent that sales can go up, rather than down.

Although the technical term luxury good is independent of the goods' quality, they are generally considered to be goods at the highest end of the market in terms of quality and price. Classic luxury goods include haute couture clothing, accessories, and luggage. Many markets have a luxury segment including, for example, automobile, yacht, wine, bottled water, coffee, tea, foods, watches, clothes, jewelry, and high fidelity.

Luxuries may be services. The hiring of full-time or live-in domestic servants is a luxury reflecting disparities of income. Some financial services, especially in some brokerage houses, can be considered luxury services by default because persons in lower-income brackets generally do not use them.

Several manufactured products attain the status of "luxury goods" due to their design, quality, durability or performance that are remarkably superior to the comparable substitutes. Thus, virtually every category of goods available on the market today includes a subset of similar products whose "luxury" is marked by better-quality components and materials, solid construction, stylish appearance, increased durability, better performance, advanced features, and so on. As such, these luxury goods may retain or improve the basic functionality for which all items of a given category are originally designed.

There are also goods that are perceived as luxurious by the public simply because they play a role of status symbols as such goods tend to signify the purchasing power of those who acquire them. These items, while not necessarily being better (in quality, performance, or appearance) than their less expensive substitutes, are purchased with the main purpose of displaying wealth or income of their owners. These kinds of goods are the objects of a socio-economic phenomenon called conspicuous consumption and commonly include luxury vehicles, watches, jewelry, designer clothing, yachts, as well as large residences, urban mansions, and country houses. Also see positional good.