What is the definition of demand in microeconomics?

In microeconomics, demand refers to the quantity of a good or service that consumers are willing and able to purchase at various prices during a given period of time. It is a fundamental concept that helps explain consumer behavior and market dynamics.

How does the law of demand explain consumer behavior?

The law of demand states that, all else being equal, as the price of a good or service decreases, the quantity demanded increases, and vice versa. This inverse relationship occurs because consumers tend to buy more of a product when it is cheaper and less when it is more expensive, reflecting their desire to maximize utility.

What factors can cause a shift in the demand curve?

Several factors can cause a shift in the demand curve, including changes in consumer income, preferences, expectations, the prices of related goods (substitutes and complements), and demographic changes. A shift to the right indicates an increase in demand, while a shift to the left indicates a decrease.

How is elasticity of demand calculated and what does it indicate?

Elasticity of demand measures how responsive the quantity demanded is to a change in price. It is calculated as the percentage change in quantity demanded divided by the percentage change in price. If the elasticity is greater than 1, demand is elastic; if it is less than 1, demand is inelastic. Elasticity indicates how sensitive consumers are to price changes.

What is the difference between individual demand and market demand?

Individual demand refers to the demand for a good or service by a single consumer, while market demand is the total demand for a good or service by all consumers in a market. Market demand is derived by summing the individual demands at each price level, providing a broader view of consumer behavior in the market.

Demand | IB DP Economics

Summary and Exam Tips for Demand

Demand is a subtopic of Microeconomics, which falls under the subject Economics in the IB DP curriculum. Demand refers to the quantity of a good or service a consumer is willing and able to purchase at various prices over a given period, assuming all other factors remain constant (ceteris paribus). The Law of Demand states that there is an inverse relationship between the price of a good and the quantity demanded. This is visually represented by a downward-sloping demand curve. Movements along the curve occur due to price changes, while shifts in the curve result from changes in non-price determinants such as income, tastes, and the prices of related goods.

Non-price determinants include income, tastes, future price expectations, and the prices of substitutes and complements. A change in income affects demand differently for normal goods (positively correlated) and inferior goods (inversely correlated). The income effect and substitution effect explain consumer behavior changes due to price variations. The Law of Diminishing Marginal Utility suggests that as more of a good is consumed, the additional satisfaction decreases, influencing the demand curve's slope. Understanding the distinction between individual and market demand is crucial, as market demand aggregates individual demands.

Exam Tips

Understand Definitions: Clearly define key terms like demand, law of demand, and demand curve. Use examples to illustrate these concepts.
Graphical Representation: Be able to draw and interpret demand curves, showing movements along the curve and shifts due to non-price determinants.
Non-Price Determinants: Memorize the factors that cause shifts in the demand curve and be prepared to explain their effects with examples.
Income and Substitution Effects: For higher-level questions, explain how these effects contribute to the law of demand.
Practice Problems: Work through examples involving changes in income, substitutes, and complements to see how they affect demand.

Demand

Exam Tips and Study Notes for Demand