Uncompensated demand is the quantity demanded at each price when you do not adjust income to offset the price change. In Intermediate Microeconomic Theory, it is the ordinary demand response that combines substitution and income effects.
Uncompensated demand is the demand schedule you get when a consumer faces a price change and you leave income alone. In Intermediate Microeconomic Theory, this is the standard, observed demand response: if the price of a good changes, the quantity chosen can change because the good is now relatively cheaper or more expensive, and because the consumer’s real purchasing power has changed too.
That is why it is called uncompensated. No cash transfer or income adjustment is made to hold the consumer at the same utility level. You are looking at the total change in quantity demanded after the price moves, not a cleaned up version that strips out the income effect. So if the price of coffee falls, uncompensated demand usually rises for two reasons at once. Coffee becomes cheaper relative to tea or soda, and the consumer can afford a bit more of everything, including coffee.
This makes uncompensated demand different from a purely hypothetical demand response that holds utility constant. In micro theory, that distinction matters because the demand curve you usually graph in a market is uncompensated. It reflects what people actually buy at each price, not just the substitution response. For normal goods, the substitution effect and income effect usually point in the same direction, so the demand curve slopes down in the familiar way.
You can also think of uncompensated demand as the bridge between consumer theory and market demand. It comes out of utility maximization with a budget constraint, and it is what you use when you want to predict real quantity changes from a price change. If the good is inferior, the income effect may offset some of the substitution effect. If it is a Giffen good, the income effect can be so strong that the total uncompensated demand rises when price rises, which is the rare case that makes demand slope upward.
In practice, the term shows up whenever you are asked to trace how a consumer or a market reacts to a price change before any offsetting income adjustment is imposed. That makes it the baseline demand concept, while compensated demand is the adjusted comparison used to isolate substitution behavior.
Uncompensated demand is the demand concept you use when you want to describe what actually happens after a price change. It is the version of demand that includes both the substitution effect and the income effect, so it is the right object for thinking about real consumption responses in markets.
This term sits right at the center of the consumer theory unit. If you cannot separate uncompensated demand from compensated demand, it becomes hard to explain why a demand curve slopes down, why some goods react more strongly to price changes than others, or why Giffen goods are such an exception. It also helps you read diagrams and problem sets that ask for total quantity changes rather than just the substitution component.
A lot of intermediate micro questions are really asking, "What happens to chosen quantity when price changes and income stays fixed?" That is uncompensated demand. Once you know that, you can compare it with a compensated response, trace the income effect, and make sense of the consumer’s final choice.
Keep studying Intermediate Microeconomic Theory Unit 1
Visual cheatsheet
view galleryCompensated Demand
Compensated demand removes the income effect by adjusting income so the consumer stays on the same utility level after a price change. Uncompensated demand is the full response you observe without that adjustment. If a problem asks for the difference between total demand change and pure substitution, this is the pair you separate.
Substitution Effect
The substitution effect is one piece of uncompensated demand. When a good gets cheaper relative to alternatives, consumers shift toward it even if their utility is held constant. In a price-change problem, this is the movement caused by relative prices, not by changes in purchasing power.
Income Effect
The income effect is the other piece built into uncompensated demand. A price drop makes consumers effectively richer, so they may buy more of the good or less, depending on whether the good is normal or inferior. This is what you add to the substitution effect to get the total quantity change.
Giffen Goods
Giffen goods are the rare case where the income effect is so strong that it overwhelms the substitution effect. That means uncompensated demand can rise when price rises. If you are checking whether a demand curve can slope upward in a theory question, this is the exception to remember.
A problem set question may give you a price change and ask for the total change in quantity demanded. That is an uncompensated demand task, so you describe the final quantity response, not just the utility held constant response. If the question includes a diagram, you may need to identify the movement along the demand curve after price changes, then explain how substitution and income effects combine.
In a utility maximization problem, you use uncompensated demand by comparing the chosen bundle before and after the price change with income unchanged. In a graphing question, you can often show it as the ordinary demand curve, then contrast it with a compensated demand curve if the prompt asks for decomposition. If the good is inferior or a candidate Giffen good, the sign of the income effect becomes the part you discuss.
Compensated demand holds utility constant by adjusting income, so it isolates the substitution effect. Uncompensated demand does not make that adjustment, so it shows the full response to price, including both substitution and income effects. If a question asks for observed market behavior, think uncompensated. If it asks for the pure substitution response, think compensated.
Uncompensated demand is the total quantity demanded at each price when income is not adjusted to offset the price change.
It combines the substitution effect and the income effect, so it matches the usual demand response you see in the market.
For normal goods, a price fall usually increases uncompensated demand because both effects push quantity in the same direction.
For inferior goods, the income effect can partly cancel the substitution effect, and for Giffen goods it can overpower it.
If a problem asks for ordinary demand behavior after a price change, uncompensated demand is usually the concept you want.
It is the quantity a consumer chooses at each price when income is left unchanged after the price change. This is the usual demand response, so it includes both substitution and income effects. In other words, it is the full change in quantity demanded rather than the isolated pure substitution response.
Compensated demand adjusts income so the consumer stays at the same utility level, which strips out the income effect. Uncompensated demand does not make that adjustment, so it shows the total effect of the price change. If you are separating consumer responses, uncompensated demand is the raw demand change and compensated demand is the cleaned up comparison.
Yes, but only in special cases like Giffen goods. That happens when the income effect is strong enough to outweigh the substitution effect. For most goods, uncompensated demand slopes downward because the substitution effect and income effect both push quantity in the same direction.
Look for the total quantity response after a price change, with no income adjustment built in. If a question gives you utility or indifference curve information, you may need to compare the final chosen bundle to a compensated one to separate effects. If it asks what happens in the market after a price change, uncompensated demand is usually the right answer.