Luxury goods
Luxury goods
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Luxury goods

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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 more significant 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.

The word "luxury" has an etymological cognate in the Latin verb luctor meaning "to overextend" or "to strain". From this, the noun luxuria and the verb luxurio developed, "indicating immoderate growth, swelling, ... in persons and animals, willful or unruly behavior, disregard for moral restraints, and licentiousness", and the term has had negative connotations for most of its long history. One definition in the OED is a "thing desirable but not indispensable".

Economists can identify a luxury good by comparing the demand for the good at one point in time against the demand for the good at a different 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.

With increasing accessibility to luxury goods, new product categories[which?] 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 diffused into the masses, defining the word has become more difficult.

Whereas "luxury" often refers to 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 defined as "hedonic escapism".

"Superior goods" is the gradable antonym of "inferior good". 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.[citation needed]

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