Ordinary_good, Ordinary_good Information, Ordinary


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An ordinary good is a microeconomic concept used in consumer theory. It is defined as a good which creates increased demand when the price for the good drops or conversely decreased demand if the price for the good increases, ceteris paribus. It is the opposite of a Giffen good.

Since the existence of Giffen goods outside the realm of economic theory is still contested, the pairing of Giffen goods with ordinary goods has gotten less traction in economics textbooks than the pairing normal good/inferior good used to distinguish responses to income changes. The usage of "ordinary good" is still useful since it allows a simple representation of price and income changes. A normal good is always ordinary, while an ordinary good can be either normal or inferior.

Distinction between income and price effects

Income change			Price change
	Normal good	Inferior good		Ordinary good	Giffen good
Income up	Consumption up	Consumption down	Price up	Consumption down	Consumption up
Income down	Consumption down	Consumption up	Price down	Consumption up	Consumption down

References

Hal Varian, Intermediate Microeconomics: A Modern Approach, Sixth Edition, chapter 6

Types of goods

public good - private good - common good - common-pool resource - club good - anti-rival goods

rivalrous good and non-excludable good complement good vs. substitute good free good vs. positional good

(non-)durable good - intermediate good (producer good) - final good - capital good
inferior good - normal good - ordinary good - Giffen good - luxury good - Veblen good - superior good
search good - (post-)experience good - merit good - credence good - demerit good - composite good

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Ordinary_good

Distinction between income and price effects

See also

References