The Theory of Demand: JAMB Economics Questions, Answers & Notes

What The Theory of Demand covers in the JAMB Economics syllabus

Demand is the quantity of a good consumers are willing and able to buy at a given price. The law of demand states an inverse relationship: as price rises, quantity demanded falls, giving a downward-sloping demand curve. A change in the good's own price causes a movement along the curve; changes in other factors (income, tastes, population, prices of related goods) shift the whole curve. Related goods are substitutes (tea/coffee — replace each other) or complements (cars/fuel — used together). By income response, goods are normal (demand rises with income) or inferior (demand falls). Types of demand include direct, derived (e.g. labour), joint/complementary and composite.

For The Theory of Demand, JAMB expects you to be able to:

• State the law of demand and describe the demand curve/schedule
• Distinguish movement along and shifts of the demand curve
• Classify goods (substitutes, complements, normal, inferior) and types of demand

Key facts & revision notes: The Theory of Demand

These are the recurring points our The Theory of Demand questions test — revise them until each feels automatic, then practise the questions above to lock them in.

• Demand is the quantity buyers are willing and able to purchase at a given price.
• The law of demand: as price rises, quantity demanded falls (an inverse relationship).
• The demand curve slopes downward, reflecting the inverse price–quantity relationship.
• A change in the good's own price causes a movement along the demand curve.
• Non-price factors (income, taste, population, etc.) shift the whole demand curve.
• Complementary goods (e.g.
• cars and fuel) are used together.
• tea and coffee) can replace each other.
• An inferior good sees demand fall as income rises (people switch to better alternatives).
• For a normal good, demand rises as income rises.
• Higher income increases demand for normal goods, shifting the demand curve to the right.
• A change in tea's own price moves along the curve, not shifting it; the others shift it.
• Cheaper cars mean more cars used, so demand for fuel (a complement) rises.
• When coffee gets dearer, consumers switch to tea, so tea's demand rises.
• Effective demand is a want backed by both the ability and the willingness to pay.
• A demand schedule lists the quantities demanded at different prices.
• Demand for labour is derived demand — it depends on demand for the goods it helps produce.
• Joint (complementary) demand is demand for goods used together.
• A larger population increases demand, shifting the demand curve to the right.
• The law of demand states an inverse (negative) relationship between price and quantity demanded.
• A good wanted for its own use has direct (autonomous) demand.
• The quantities buyers will buy at each price form their demand.
• Lower price raises quantity demanded (law of demand).
• A demand curve slopes down from left to right.

Worked examples

Three The Theory of Demand questions with the answer and a short explanation, so you can see how the topic is set before you practise the full set.

How The Theory of Demand is tested in JAMB Economics

Our The Theory of Demand bank holds 40 questions (2 easy, 18 medium, 20 hard). JAMB Economics typically returns to The Theory of Demand year after year, so steady practice on this topic is high-value revision. Questions are multiple-choice with four options, and at UTME pace you get roughly 40 seconds each — which is why timed practice matters.

How to answer The Theory of Demand questions

Work the stem first and predict the answer before you look at the options; then eliminate the ones that contradict the key facts above. Watch for “which is not…”, “all of the above” and “except” style stems, which are where rushed candidates lose easy marks on The Theory of Demand. If a calculation or a precise definition is involved, work it from first principles rather than guessing from a half-remembered rule. When two options look right, re-read the stem for the qualifier that separates them — JAMB rarely repeats an option by accident. If you are still unsure, eliminate the two weakest choices to lift your odds, flag the question, and move on; never burn a full minute on one Economics item when the exam gives you about forty seconds each. Then come back to flagged questions with whatever time remains. The single most reliable way to get faster at The Theory of Demand is repeated timed practice, so use the button above until the recurring patterns feel automatic.

Common mistakes to avoid in The Theory of Demand

The errors that cost marks on The Theory of Demand are usually careless rather than conceptual: misreading a negative stem, confusing two similar terms, or rushing a definition you actually know. Candidates also over-rely on “expo” and last-minute cramming instead of understanding the topic — which fails the moment JAMB rephrases a familiar idea. Treat every option as a claim to be checked against the facts above, keep your working tidy for any calculation, and don’t change a considered answer on a hunch. Above all, revise The Theory of Demand actively by answering questions, not just by re-reading notes — recall under time is what the exam rewards.

Frequently asked questions

Is The Theory of Demand part of the JAMB Economics syllabus?

Yes. The Theory of Demand is a recognised topic in the JAMB Economics syllabus, covering state the law of demand and describe the demand curve/schedule. You should be able to recall its key facts and apply them to multiple-choice questions.

How many The Theory of Demand questions can I practise on Belmadeng?

There are 40 original, JAMB-standard The Theory of Demand questions in our free bank, each with the correct answer and a worked explanation. You can practise them untimed or as a timed test.

What are the most important points to know about The Theory of Demand?

Demand is the quantity of a good consumers are willing and able to buy at a given price. The law of demand states an inverse relationship: as price rises, quantity demanded falls, giving a downward-sloping demand curve. A change in the good's own price causes a movement along the curve; changes in o…

How do I answer The Theory of Demand questions quickly in JAMB?

Read the stem carefully, eliminate clearly wrong options, and match the remaining choices to the key facts for The Theory of Demand. Practising timed The Theory of Demand questions builds the speed you need for UTME's pace of about 40 seconds per question.

Are these JAMB Economics The Theory of Demand questions past questions or original?

They are original questions written to JAMB (UTME) standard and mapped to the official syllabus — not reproduced past papers. This keeps them legal to use freely while closely mirroring how the real exam tests the topic.

Where can I practise The Theory of Demand questions free without signing up?

Right here — tap “Start The Theory of Demand practice” on this page to begin instantly. Belmadeng's CBT practice is completely free and needs no sign-up, download or subscription.

About these questions: original, JAMB-standard items written from the official UTME Economics syllabus (last reviewed 2026-09-18). Belmadeng is an independent study platform and is not affiliated with JAMB. Spotted an error? Use the report link.