ORDINARY VS GIFFEN GOODS | Microeconomics | Diagrammatic explanation (Hons/MA/MSc.)

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A Giffen good is a low income, non-luxury product that defies standard economic and consumer demand theory. Demand for Giffen goods rises when the price rises and falls when the price falls. In econometrics, this results in an upward-sloping demand curve, contrary to the fundamental laws of demand which create a downward sloping demand curve.
The term "Giffen goods" was coined in the late 1800s, named after noted Scottish economist, statistician, and journalist Sir Robert Giffen. The concept of Giffen goods focuses on a low income, non-luxury products that have very few close substitutes.
Giffen goods can be compared to Veblen goods which similarly defy standard economic and consumer demand theory but focus on luxury goods.
Examples of Giffen goods can include bread, rice, and wheat. These goods are commonly essentials with few near-dimensional substitutes at the same price levels.
Giffen goods are a rarity in economics because supply and demand for these goods are opposite of standard conventions. Giffen goods can be the result of multiple market variables including supply, demand, price, income, and substitution. All of these variables are central to the basic theories of supply and demand economics. Examples of Giffen goods are a study in the effects of these variables on low-income, non-luxury goods which result in an upward sloping demand curve.
An ordinary good is a microeconomic concept used in consumer theory. It is defined as a good which creates an increase in quantity demanded when the price for the good drops or conversely a decrease in quantity demanded 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 normal, inferior or sticky.