Introduction to Price Determination In a market economy, prices are determined by the interaction of supply and demand forces. The price at which the quantity s...
In a market economy, prices are determined by the interaction of supply and demand forces. The price at which the quantity supplied equals the quantity demanded is known as the equilibrium price. This equilibrium ensures efficient resource allocation and market efficiency.
The law of demand states that as the price of a good or service increases, the quantity demanded decreases, all other factors remaining constant. Conversely, the law of supply states that as the price increases, the quantity supplied also increases.
The market equilibrium is determined by the intersection of the supply and demand curves, as shown in the following diagram:
At the equilibrium price (Pe) and equilibrium quantity (Qe), the amount buyers are willing and able to purchase equals the amount sellers are willing and able to supply. This equilibrium balances the market forces of supply and demand, ensuring efficient resource allocation and market efficiency.
Problem: In a market for widgets, the supply function is Qs = 2P, and the demand function is Qd = 100 - 5P, where Q is the quantity and P is the price. Calculate the equilibrium price and quantity.
Solution:
At the equilibrium price and quantity, resources are allocated efficiently, and market efficiency is achieved. Any deviation from the equilibrium price leads to either a shortage (Qd > Qs) or a surplus (Qs > Qd), indicating a temporary imbalance in the market.
For further reading on price determination and market equilibrium, refer to the BBC Bitesize GCSE Economics revision guide.