A Veblen good is a type of luxury good for which the demand increases as the price increases, in apparent (but not actual) contradiction of the law of demand, resulting in an upward-sloping demand curve. The higher prices of Veblen goods may make them desirable as a status symbol in the practices of conspicuous consumption and conspicuous leisure. A product may be a Veblen good because it is a positional good, something few others can own.
Veblen goods are named after American economist Thorstein Veblen, who first identified conspicuous consumption as a mode of status-seeking (i.e., keeping up with the Joneses) in The Theory of the Leisure Class (1899). The testability of this theory was questioned by Colin Campbell due to the lack of complete honesty from research participants. However, research in 2007 studying the effect of social comparison on human brains can be used as an evidence supporting Veblen. The idea that seeking status can be an incentive to spend was also later discussed by Fred Hirsch.
Additionally, there have been different arguments on whether Veblen’s theory applies only to luxury goods or all goods.
A corollary of the Veblen effect is that lowering the price may increase the demand at first, but will decrease the quantity demanded afterwards.
The following concepts can explain the existence of Veblen goods:
The theory of Veblen good made a significant contribution towards marketing and advertising. There are multiple studies considering Veblen goods as a tool to develop and maintain a strong relationship with consumers.
While Veblen goods are more affordable for high income households and affluent societies are usually known as the targeted income groups of Veblen brands, they have been experiencing a trend away from conspicuous consumption.
Despite what appears to be a violation of the law of demand, the upward-sloping demand curve for a Veblen good does not actually violate the Law. This is because the good's social value depends on the price; in other words, the good itself changes as the price changes. This is illustrated when looking at the derivative of societal demand for a social good (goods whose value depends on others' consumption of it) with respect to price:
In other words, the rise in price increases the societal demand for the good. Because an individual demands less of this good the more others have, the entire left-hand side is positive, meaning the right-hand side is positive. The RHS means that, in general, people will demand more of the social good as the higher price goes (though not necessarily every individual will do so). Because the price itself leads to a change in the social good's value, as opposed to a pure price effect leading to an increase in demand, this does not constitute a law of demand violation.
Being aware of the existence of Veblen goods, concerns were raised regarding their wastefulness  as they are viewed as deadweight loss. Consuming Veblen goods also results in other financial and social consequences such as conspicuous demonstration of unequal wealth distribution  and the need to adjust tax formulas. Another negative outcome is that this type of consumption can be a culprit of the future exacerbation of pollution.
Nonetheless, one exception is ethical consumers interested in virtue signaling through their consumption of goods and services. Veblen goods targeting this market segment must also be ethically manufactured to increase in their quantity demanded.
The Veblen effect is one of a family of theoretical anomalies in the general law of demand in microeconomics. Related effects include:
Sometimes, the value of a good increases as the number of buyers or users increases. This is called the bandwagon effect when it depends on the psychology of buying a product because it seems popular, or the network effect when a large number of buyers or users itself increases the value of a good. For example, as the number of people with telephones or Facebook accounts increased, the value of having a telephone or Facebook account increased because the user could reach more people. However, neither of these effects suggests that raising the price would boost demand at a given level of saturation.
Some of these effects are discussed in a 1950 article by economist Harvey Leibenstein. Counter-examples have been called the counter-Veblen effect.
The effect on demand depends on the range of other goods available, their prices, and whether they serve as substitutes for the goods in question. The effects are anomalies within demand theory, because the theory normally assumes that preferences are independent of price or the number of units being sold. They are therefore collectively referred to as interaction effects.
Interaction effects are a different kind of anomaly from that posed by Giffen goods. The Giffen goods theory is one for which observed quantity demanded rises as price rises. Still, the effect arises without any interaction between price and preference—it results from the interplay of the income effect and the substitution effect of a price change.