Why specialisation necessitates an efficient means of exchanging goods and services, such as the use of money as a medium of exchange
When workers specialise in producing one thing, they need a reliable way to trade for everything else. Money solves this by acting as a universally accepted means of payment.
Real World
In post-WWI Germany, hyperinflation destroyed money's role as a medium of exchange so effectively that workers were paid twice daily and used wheelbarrows of cash to buy bread — demonstrating what happens when the exchange mechanism breaks down.
Exam Focus
Explain the double coincidence of wants problem first, then show how money resolves it — this two-step logic is what examiners expect for full marks.
Price Elasticity of Demand
PED = % change in quantity demanded ÷ % change in price
How well did you know this?