DEMAND

Demand simply means the quantity of goods or services that consumers are willing and able to buy at different prices during a specific period. Think of it this way: when the price of Indomie noodles drops from ₦200 to ₦150 per pack, more people rush to buy it. That increased buying is demand in action.

The law of demand states that as price falls, quantity demanded increases, and vice versa. This happens because goods become more affordable when prices drop, so consumers buy more. A demand schedule is a table showing different prices and their corresponding quantities demanded. When you plot this information on a graph, you get a demand curve—a downward-sloping line that visually represents this relationship.

Demand changes due to several reasons: income levels, consumer preferences, prices of related goods, and population size all influence how much people want to buy.

Demand usually follows a simple rule: when price falls, quantity demanded rises. However, some goods behave differently! Giffen goods and Veblen goods create upward-sloping demand curves that break this normal pattern. For example, as the price of local rice increases, poor families might buy more because they cannot afford expensive alternatives like imported rice.

Derived demand happens when people want something because they need it to produce something else. A baker demands flour because customers demand bread. Composite demand occurs when one good satisfies multiple uses—crude oil produces petrol, diesel, and kerosene simultaneously. Joint demand involves goods that must be used together, like cars and petrol.

Understanding these concepts helps you analyse real-world markets beyond basic supply and demand.

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Demand means the quantity of goods and services people are willing and able to buy at different prices during a specific period. Think of it as what customers actually purchase, not just what they wish for.

The price of a good is the most important factor affecting demand. When prices drop, people buy more; when prices rise, they buy less. This relationship is called the law of demand. For example, if tomatoes in Yaba market cost ₦500 per paint, many households will buy them. But if the price jumps to ₦1,500, fewer families can afford them, so demand falls.

Other factors also matter: income levels, consumer preferences, prices of related goods, and population size all influence how much people demand. Understanding these relationships helps businesses set prices wisely and predict customer behaviour.

Demand simply means the quantity of goods consumers are willing and able to buy at different prices during a specific period. But demand doesn't exist in isolation—several factors influence how much of a product people want to purchase.

The main determinants of demand include the price of the commodity itself, prices of related goods, consumer income, tastes and preferences, and price expectations. For instance, when the price of rice increases in Nigeria, demand typically falls because consumers switch to cheaper alternatives like beans or garri. Similarly, if your family's income rises, you might demand more quality goods like imported products instead of local substitutes.

Tastes also matter significantly. The growing preference for smartphone usage in Nigeria has dramatically increased demand for data bundles and reduced demand for internet cafés. Additionally, if consumers expect prices to rise tomorrow, they'll demand more today to avoid paying higher prices later.

Understanding these determinants helps you predict market behavior accurately.

Think of demand like your decision to buy rice at Lekki market. When the price of rice changes from ₦15,000 to ₦20,000 per bag, you buy less rice. This price change causes you to move along the same demand curve—same curve, different point. It's like sliding up or down a ladder.

Now imagine the government announces free rice distribution. Suddenly, everyone wants to buy less rice at every price point. The entire demand curve shifts left. This shift happens because something other than price changed—maybe income, preferences, or expectations.

The key difference: price changes create movement along the curve, while other factors like income, taste, or competitor prices cause the whole curve to shift position. WAEC loves testing this distinction because students often confuse them.

Elasticity of demand measures how responsive consumers are when prices change. Think of it this way: when the price of garri increases in your local market, do people stop buying it completely, or do they still purchase almost the same quantity? That's elasticity.

Price elasticity specifically shows the percentage change in quantity demanded divided by the percentage change in price. In Nigeria, when fuel prices rise sharply, most people still buy fuel because they need it for transportation—this is inelastic demand. But when the price of luxury items like phones increases, people buy fewer of them—this is elastic demand.

There are three types: elastic (demand changes significantly with price), inelastic (demand barely changes), and unitary elastic (demand changes proportionally with price).

When your parents' salary increases, you buy more of certain goods—this relationship is what income elasticity measures. It shows how demand changes when income changes. For luxury goods like smartphones, demand rises sharply when income increases. For basic goods like garri, demand hardly changes because families already buy what they need.

Cross elasticity measures how demand for one product changes when the price of another changes. Tea and sugar are complementary goods—when sugar prices rise, fewer people buy tea because the combination becomes expensive. Conversely, Indomie and Golden Morn are substitutes; when Indomie prices increase, more people switch to Golden Morn.

Understanding these elasticities helps businesses predict consumer behavior and plan production.

Demand simply means the quantity of goods or services people are willing and able to buy at different prices. When you want to buy a phone but can only afford it at a certain price, you're showing demand.

For consumers, demand determines what they can buy and at what cost. When demand for tomatoes increases during the rainy season in Nigeria, prices rise, affecting how many tomatoes families can purchase. For producers, high demand means more profit opportunities, so they increase production. Low demand forces them to reduce output or prices. Government uses demand information to plan policies. If demand for electricity increases, the government knows it must invest in power generation. Understanding demand helps government set taxes, control inflation, and ensure goods are affordable for citizens.

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