SQA National 5 Economics: Economics of the Market - scarcity, demand, supply, the price mechanism and the firm

What the Economics of the Market area demands

This area is the microeconomic foundation of National 5 Economics. It explains why scarcity forces choices, how buyers and sellers interact in a market, how the price mechanism sets prices, and how a firm measures its costs, revenue and profit. The examiners reward precise definitions, correct demand-and-supply diagrams, and the ability to trace a real event through to a change in price and quantity. Each topic has a matching dot-point page with worked questions; this overview ties them together.

The basic economic problem

The area opens with the basic economic problem: resources are scarce but wants are unlimited, so choices must be made. Every choice has an opportunity cost - the next best alternative given up. Goods and services are made from four factors of production: land (reward: rent), labour (wages), capital (interest) and enterprise (profit).

Personal economics

Personal economics applies the problem to the household. Income comes from wages, rent, interest and profit. Households choose how to spend, save and borrow, plan with a budget, and manage risk and uncertainty through saving, insurance and spreading their money. Borrowing brings spending forward but must be repaid with interest.

Demand and supply

Demand is the quantity buyers are willing and able to buy at each price; the law of demand gives a downward-sloping curve. Supply is the quantity producers will sell at each price; the law of supply gives an upward-sloping curve. For both, a change in the good's own price is a movement along the curve, while a change in any other factor is a shift. Demand shifts with income, tastes, the price of related goods and population; supply shifts with costs of production, technology, taxes and subsidies, and weather.

Market equilibrium and the price mechanism

Demand and supply cross at the equilibrium price, where the market clears. Above it there is a surplus and price falls; below it a shortage and price rises. This price mechanism allocates scarce resources automatically. When demand or supply shifts, the equilibrium moves: a demand shift moves price and quantity the same way; a supply shift moves them in opposite directions.

Costs, revenue and profit

A firm's costs are fixed (unchanged with output) plus variable (change with output), giving total cost; dividing by output gives average cost. Total revenue is price times quantity, and average revenue is the price per unit. Profit = total revenue - total cost, the reward to enterprise and the incentive to produce.

How this area is examined

A typical SQA profile for Economics of the Market:

• Definitions and diagrams. Demand and supply curves, equilibrium, surpluses and shortages must be drawn and labelled correctly.
• Movement versus shift. Many marks turn on correctly identifying a movement along a curve as opposed to a shift of the whole curve.
• Tracing a shift to a new equilibrium. Stimulus questions ask you to explain how a real event changes the equilibrium price and quantity.
• Simple calculations. Total cost, average cost, total revenue and profit appear in numerical questions.

Check your knowledge

A mix of recall and application questions covering the area. Attempt them, then check against the solutions.

1. Define opportunity cost. (1 mark)
2. Name the four factors of production. (2 marks)
3. A good's own price falls. Is this a movement or a shift on the demand curve? (1 mark)
4. State what happens to the equilibrium price and quantity when supply increases. (2 marks)
5. Total revenue is £50,000 and total cost is £41,000. Calculate the profit. (1 mark)