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In economics, an inferior good is a good that decreases in demand when consumer income rises (or rises in demand when consumer income decreases), unlike normal goods, for which the opposite is observed. Normal goods are those for which consumers' demand increases when their income increases.  This would be the opposite of a superior good, one that is often associated with wealth and the wealthy, whereas an inferior good is often associated with lower socio-economic groups.
Inferiority, in this sense, is an observable fact relating to affordability rather than a statement about the quality of the good. As a rule, these goods are affordable and adequately fulfill their purpose, but as more costly substitutes that offer more pleasure (or at least variety) become available, the use of the inferior goods diminishes.
Depending on consumer or market indifference curves, the amount of a good bought can either increase, decrease, or stay the same when income increases.
There are many examples of inferior goods. Several economists have suggested that shopping at large discount chains such as Walmart and rent-to-own establishments vastly represent a large percentage of goods referred to as "inferior". Cheaper cars are examples of the inferior goods. Consumers will generally prefer cheaper cars when their income is constricted. As a consumer's income increases the demand of the cheap cars will decrease, while demand of costly cars will increase, so cheap cars are inferior goods.
Inter-city bus service is also an example of an inferior good. This form of transportation is cheaper than air or rail travel, but is more time-consuming. When money is constricted, traveling by bus becomes more acceptable, but when money is more abundant than time, more rapid transport is preferred.
Certain financial services, including payday lending, are inferior goods. Such financial services are generally marketed to persons with low incomes. People with middle or higher incomes can typically use credit cards that have better terms of payment or bank loans for higher volumes and much lower rates of interest. 
Inexpensive foods like bologna, hamburger, mass-market beer, frozen dinners, and canned goods are additional examples of inferior goods. As incomes rise, one tends to purchase more expensive, appealing and nutritious foods. Likewise, goods and services used by poor people for which richer people have alternatives exemplify inferior goods. As a rule, used and obsolete goods (but not antiques) marketed to persons of low income as closeouts are inferior goods at the time even if they had earlier been normal goods or even luxury goods.
Others are very inconsistent across geographic regions or cultures. The potato, for example, generally conforms to the demand function of an inferior good in the Andean region where the crop originated. People of higher incomes and/or those who have migrated to coastal areas are more likely to prefer other staples such as rice or wheat products as they can afford them. However, in several countries of Asia, such as Bangladesh, potato is not an inferior good, but rather a relatively expensive source of calories and a high-prestige food, especially when eaten in the form of "French fries" by urban elites.
A special type of inferior good may exist known as the Giffen good, which would disobey the "law of demand". Quite simply, when the price of a Giffen good increases, the demand for that good increases. This would have to be a good that is such a large proportion of a person or market's consumption that the income effect of a price increase would produce, effectively, more demand. The observed demand curve would slope upward, indicating positive elasticity.
It was noted by Sir Robert Giffen III that in Ireland during the 19th century there was a rise in the price of potatoes. The poor people were forced to reduce their consumption of meat and expensive items as eggs etc. Now potatoes being still the cheapest food, they started consuming more of it even though its price was rising. This phenomenon is often described as "Giffen's Paradox".
- Mankiw, N. Gregory, Principles of Economics, South-Western Cengage Learning, 2012, p.70
- "Economics A–Z", the Economist
- Sullivan, arthur; Steven M. Sheffrin (2003), Economics: Principles in action, Upper Saddle River, New Jersey 07458: Pearson Prentice Hall, p. 87, ISBN 0-13-063085-3
- Scott, G.J.; Bouis, H.E., "Sustainability of Potato Consumption in Developing Countries: The Case of Bangladesh", International Potato Center