Demand, Supply and How Markets Work: Question 5

Worked solution

Part (a): Defining a market

A market is any arrangement that brings together the buyers and sellers of a good, a service, or a factor of production, so that they can exchange with each other. Importantly, a market does not have to be a physical place. A shop, a street stall, an online noticeboard and a global commodity exchange can all count as markets, as long as they connect buyers with sellers.

Part (b): The roles of buyers and sellers

• Buyers are willing and able to purchase the good at a given price, their behaviour creates demand.
• Sellers are willing and able to offer the good for sale at a given price, their behaviour creates supply.

A market exists wherever these two roles interact.

Part (c): Applying this to the textbook noticeboard

The school’s online noticeboard fits the definition of a market even though it has no shop and no till:

• Some students act as buyers: they want a particular second-hand textbook and are willing and able to pay for it, creating demand for that textbook.
• Other students act as sellers: they no longer need a textbook they own and are willing to offer it for sale, creating supply of that textbook.
• The noticeboard simply gives these two groups a way to find each other and exchange, which is exactly what a market does. It does not need a physical shop front to count as one.

Final answers

• (a) A market $=$ any arrangement bringing together buyers and sellers of a good, service, or factor of production, so they can exchange (no physical location required).
• (b) Buyers create demand by being willing and able to purchase; sellers create supply by being willing and able to sell.
• (c) The noticeboard is a market because it connects student buyers (demand for second-hand textbooks) with student sellers (supply of second-hand textbooks), which is the essential feature of any market.