The nature of markets and demand

Markets act as places where buyers and sellers come together to trade goods and services. They can be physical locations, such as shops, or virtual spaces, like online platforms. In any market, the price of a good or service and the amount traded depend on the balance between demand and supply.

Key features of markets

• Prices and quantities are set by how much buyers want the item (demand) and how much sellers provide (supply).
• Diagrams are used to illustrate these levels, with the vertical axis showing price and the horizontal axis showing quantity demanded or supplied.

Demand

Demand refers to the amount of a good or service that buyers are both willing and able to purchase at a specific price during a certain period. A demand curve illustrates the link between price and the quantity demanded, showing how much would be bought at each price point. Demand curves typically slope downwards, meaning that as prices rise, the quantity demanded falls. This pattern follows the law of diminishing marginal utility.

Movements along the demand curve

Changes in the price of a good or service lead to movements along the demand curve, altering the quantity demanded without shifting the curve itself.

Causes and effects of price changes on demand:

• Extension in demand - When the price drops, the quantity demanded increases.
• Contraction in demand - When the price rises, the quantity demanded decreases.

These movements occur solely due to price adjustments.

Shifts in the demand curve and influencing factors

A shift in the demand curve happens when the quantity demanded changes at every price level, moving the entire curve left or right. A rightward shift indicates higher demand overall, while a leftward shift shows lower demand.

Factors leading to demand curve shifts

Tastes and fashions:

• If a product becomes trendy, demand shifts right.
• If it falls out of favour, demand shifts left.

Real income changes:

• Adjustments in people's purchasing power affect demand differently depending on the type of good.
• Normal goods - Demand increases with rising real income, shifting the curve right.
• Inferior goods - Demand decreases with rising real income, shifting the curve left.

Income distribution:

• A more even spread of wealth can reduce demand for luxury items (shifting their curve left) and increase demand for standard goods (shifting their curve right).

Interrelationships between markets

Markets do not operate in isolation; changes in one can influence others through connections between goods. This interdependence affects demand patterns across related products.

Types of market interrelationships

• Substitute goods (competitive demand) - These are alternatives. If the price of one rises, demand for it falls, but demand for the substitute increases, shifting its curve right.
• Complementary goods (joint demand) - These are used together. A price increase in one reduces demand for both, shifting their curves left.
• Impact of new products - Launching a new item can decrease demand for substitutes (shifting their curve left) and increase demand for complements (shifting their curve right).
• Derived demand - This occurs when demand for one item stems from demand for another, such as the need for steel rising if car production increases.
• Composite demand - Goods with multiple applications, like wheat for food or animal feed, face demand from various sources. A surge in one use can limit supply for others, potentially raising prices and shifting supply curves in those markets.