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In economics, a luxury good (or upmarket good) is a good for which demand increases more than proportionally as income rises, so that expenditures on the good become a greater proportion of overall spending.
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, with a different income level. When income goes up, demand for luxury goods goes up even more than income went up. When income goes down, demand for luxury goods go down even more than income went down. For example, if income goes up 1%, and the demand for a product goes up 2%, then the product is a luxury good.
This contrasts with basic goods, for which demand stays the same or decreases only slightly as income goes down.
Luxury goods have high income elasticity of demand: as people become wealthier, they will buy proportionately more luxury goods. This also means, however, that should there be a decline in income its demand will drop more than proportionately. 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 necessity good or even an inferior good at different income levels.
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. However, it is important to note that Veblen goods are not the same as luxury goods in general.
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, luxury versions of automobiles, yachts, wine, bottled water, coffee, tea, foods, watches, clothes, jewelry, and high fidelity sound equipment.
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.
Luxury goods often have special luxury packaging to differentiate the products from mainstream competitors.
Originally, luxury goods were available only to the very wealthy and "aristocratic world of old money" that offered them a history of tradition, superior quality, along with a pampered buying experience. Luxury goods have been transformed by a shift from custom-made (bespoke) works with exclusive distribution practices by specialized, quality-minded family-run and small businesses to a mass production of specialty branded goods by profit-focused large corporations and marketers. The trend in modern luxury is simply a product or service that is marketed, packaged, and sold by global corporations that are focused "on growth, visibility, brand awareness, advertising, and, above all, profits." Increasingly, luxury logos now available to all consumers at a premium price across the world including online.
The three dominant trends are the main factors that have accelerated the rapid growth of the industry, including the customer base and variations in the consumptions of different brands. The three dominant trends in the global luxury goods market are globalization, consolidation, and diversification. Consolidation involves the growth of big companies and ownership of brands across many segments of luxury products. Examples include LVMH, Richemont, and Kering, which dominate the market in areas ranging from luxury drinks to fashion and cosmetics. Global consumer companies, such as Procter & Gamble, are also attracted to the industry, due to the difficulty of making a profit in the mass consumer goods market. The customer base for various luxury goods continue to be more culturally diversified, and this presents more unseen challenges and new opportunities to companies in this industry.
The luxury goods market has been on an upward climb for many years. Apart from the setback caused by the 1997 Asian Financial Crisis, the industry has performed well, particularly in 2000. In that year, the world luxury goods market – which includes drinks, fashion, cosmetics, fragrances, watches, jewelry, luggage, handbags – was worth close to $170 billion and grew 7.9 percent. The United States has been the largest regional market for luxury goods and is estimated to continue to be the leading personal luxury goods market in 2013, with a value of 62.5 billion euros. The largest sector in this category was luxury drinks, including premium whisky, champagne, and cognac. This sector was the only one that suffered a decline in value (-0.9 percent). The watches and jewelry section showed the strongest performance, growing in value by 23.3 percent, while the clothing and accessories section grew 11.6 percent between 1996 and 2000, to $32.8 billion. North America is the largest regional market for luxury goods. The largest ten markets for luxury goods account for 83 percent of overall sales, and include Japan, China, United States, Russia, Germany, Italy, France, United Kingdom, Brazil, Spain, and Switzerland.
In 2012, China surpassed Japan as the world's largest luxury market. China's luxury consumption accounts for over 25% of the global market. The Economist Intelligence Unit published a report on the outlook for luxury goods in Asia which explores the trends and forecasts for the luxury goods of China market across key markets in Asia. In 2014, the luxury sector is expected to grow over the next 10 years because of 440 million consumers spending a total of 880 billion euros, or $1.2 trillion.
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. These are often much larger, with less text on each page and many illustrations, and if liturgical texts were originally usually kept on the altar or sacristy rather any library that the church or monastery who owned them may have had. Secular luxury manuscripts were commissioned by the very wealthy and differed in the same ways from cheaper books.
"Luxury" may be used for other applied arts where both utilitarian and luxury versions of the same types of objects were made. This might cover metalwork, ceramics, glass, arms and armour, and a wide range of objects. It is much less used for objects with no function beyond being an artwork: paintings, drawings and sculpture, even though the disparity in cost between an expensive and cheap work may have been as large.
Scope of the term
With increasing "democratization" of 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, which sometimes called the "aspiring class" in this context. Because luxury has now diffused into the masses, defining the word has become more difficult.
Bringing up to the modern day the long and generally very unsuccessful history of sumptuary laws designed to curb excessive personal consumption, in February 2013, the Chinese government banned advertisements for luxury goods on its official state radio and television channels.
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.
The idea of a luxury brand is not necessarily a product or a price point, but a mindset where core values that are expressed by a brand are directly connected to the producer's dedication and alignment to perceptions of quality with its customers' values and aspirations. Thus, it is these target customers, not the product, that make a luxury brand. Brands that are considered luxury connect with their customers by communicating that they are the top of their class or considered the best in their field. Furthermore, these brands must deliver - in some meaningful way - measurably better performance. What consumers perceive as luxurious brands and products change over the years, but there appear to be three main drivers: (1) a high price, especially when compared to other brands within its segment; (2) limited supply, in that a brand may not need to be expensive, but it arguably should not be easily obtainable and contributing to the customers' feeling that they have something special; and (3) endorsement by celebrities, which can make a brand or particular products more appealing for consumers and thus more "luxurious" in their minds. Two additional elements of luxury brands include special packaging and personalization. These differentiating elements distance the brands from the mass market and thus provide them with a unique feeling and user experience as well as a special and memorable "luxury feel" for customers. However, the concept of a luxury brand is now so popular that it is used in almost every retail, manufacturing, and service sector. Moreover, new marketing concepts such as "mass-luxury" or "hyper luxury" further blur the definition of what is a luxury product, a luxury brand, or a luxury company.
Examples include LVMH (Louis Vuitton Moet Hennessy), the largest luxury good producer in the world with over fifty brands, including Louis Vuitton, the brand with the world's first fashion designer label. The LVMH group made a net profit of €8.1 billion on sales of €42.6 billion in 2017.  Other market leaders include Richemont and Kering (previously named PPR).
A rather small group in comparison, the wealthy tend to be extremely influential. Once a brand gets an "endorsement" from members of this group, then the brand can be defined as a true "luxury" brand. An example of different product lines in the same brand is found in the automotive industry, with "entry-level" cars marketed to younger, less wealthy consumers, and higher-cost models for older and more wealthy consumers.
Luxury department stores
Since the development of mass-market "luxury" brands in the 1800s, department stores dedicated to selling all major luxury brands have opened up in most major cities around the world. Le Bon Marché in Paris, France is credited as one of the first of its kind.
In the United States, the development of luxury-oriented department stores not only changed the retail industry, but also ushered the idea of freedom through consumerism and a new opportunity for middle- and upper-class women.
Luxury shopping districts
Fashion brands within the luxury goods market tend to be concentrated in exclusive or affluent districts of cities around the world. These include:
- Amsterdam's P.C. Hooftstraat
- Athens' Voukourestiou Street and Kolonaki district
- Bangalore's UB City
- Barcelona's Passeig de Gràcia
- Beijing’s Yabaolu
- Berlin's Kurfürstendamm
- Bogotá's Zona T
- Boston's Newbury Street
- Brussels' Louizalaan/Avenue Louise
- Buenos Aires' Recoleta
- Cartagena's Bocagrande
- Chicago's Oak Street
- Düsseldorf's Königsallee
- Florence's Via de' Tornabuoni
- Frankfurt's Freßgass
- Hamburg's Neuer Wall
- Hong Kong's Central, Tsim Sha Tsui
- Istanbul's Abdi İpekçi Street and İstinye Park
- Johannesburg's Sandton (Nelson Mandela Square)
- Kuala Lumpur's Bukit Bintang and KLCC
- Las Vegas's Strip (Bellagio, Crystals, Forum Shops, The Venetian)
- Leeds' Victoria Quarter
- Lisbon's Avenida da Liberdade
- London's Bond Street and Sloane Street
- Los Angeles' Beverly Hills (Rodeo Drive)
- Madrid's Calle de Serrano
- Medellín's El Poblado
- Melbourne's Collins Street
- Montería's Passage of the Sun
- Mexico City's Avenida Presidente Masaryk
- Milan's Via Monte Napoleone
- Moscow's Tverskaya Street
- Munich's Maximilianstraße
- New York's Madison Avenue, Fifth Avenue and SoHo
- Paris' Champs-Élysées, Avenue Montaigne and Rue du Faubourg Saint-Honoré
- Palm Beach's Worth Avenue 
- Panama City's Multiplaza Pacific
- Prague's Pařížská
- Rome's Via Condotti
- San Francisco's Union Square
- San Jose’s Santana Row
- Santiago's Parque Arauco
- São Paulo's Rua Oscar Freire
- Seoul's Cheongdam-dong
- Shanghai's Middle Huaihai Road
- Singapore's Orchard Road
- Stockholm's Biblioteksgatan
- Sydney's Castlereagh Street
- Taipei's Xinyi District
- Tel Aviv's Kikar Hamedina
- Tokyo's Ginza and Aoyama
- Toronto's Mink Mile
- Vancouver's [Alberni Street
- Warsaw's Nowy Świat Street 
- Zürich's Bahnhofstrasse
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