Luxury Goods
In economics, a luxury good (or upmarket good) is a good for which demand increases more than what is proportional as income rises, so that expenditures on the good become a greater proportion of overall spending. Luxury goods are in contrast to necessity goods, where demand increases proportionally less than income. Luxury goods is often used synonymously with superior goods.

Definition and etymology

The word "luxury" derives from the Latin verb luxor meaning to overextend or strain.
From this the noun luxuria and verb luxurio developed, "indicating immoderate growth, swelling, ... in persons and animals, willful or unruly behavior, disregard for moral restraints, and licensciousness", and the term has had negative connotations for most of its long history. One definition in the OED is a "thing desirable but not necessary". A luxury good can be identified by comparing the demand for the good at one point in time against the demand for the good at a different point in time, at a different income level. When personal income increases, demand for luxury goods increases even more than income does.

Conversely, when personal income decreases, demand for luxury goods drops even more than income does. For example, if income rises 1%, and the demand for a product rises 2%, then the product is a luxury good. This contrasts with necessity goods, or basic goods, for which demand stays the same or decreases only slightly as income decreases.

Scope of the term

With increasing accessibility to luxury goods, new product categories have been created within the luxury market, called "accessible luxury" or "mass luxury". These are meant specifically for the middle class, sometimes called the "aspiring class" in this context. Because luxury has now diffused into the masses, defining the word has become more difficult.Whereas luxury often refers to a certain types of products, luxury is not restricted to physical goods; services can also be luxury. Likewise, from the consumer perspective, luxury is an experience that has been defined as "hedonic escapism."

Confusion with normal goods

"Superior goods" is the gradable antonym of "inferior goods". If the quantity of an item demanded increases with income, but not by enough to increase the share of the budget spent on it, then it is only a normal good and is not a superior good. Consumption of all normal goods increases as income increases. For example, if income increases by 50%, then consumption will increase (maybe by only 1%, maybe by 40%, maybe by 70%). A superior good is a normal good for which the proportional consumption increase exceeds the proportional income increase. So, if income increases by 50% then consumption of a superior good will increase by more than 50% (maybe 51%, maybe 70%).

In economics terminology, all goods with an income elasticity of demand greater than zero are "normal", but only the subset having income elasticity of demand > 1 are "superior".Some articles in the microeconomics discipline use the term superior-good as an alternative to an inferior good, thus making "superior goods" and "normal goods" synonymous. Where this is done, a product making up an increasing share of spending under income increases is often called an ultra-superior good.

Art history

Though often verging on the meaningless in modern marketing, "luxury" remains a legitimate and current technical term in art history for objects that are especially highly decorated to very high standards and use expensive materials. The term is especially used for medieval manuscripts to distinguish between practical working books for normal use, and fully illuminated manuscripts, that were often bound in treasure bindings with metalwork and jewels.
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