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.
|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|