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Exercises · Q17

Q.In what respect do the supply and demand curves in the labour market differ from those in the goods market?

Rajasthan RbseTextbookSubjective· 3mImportance★★★★★
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Labour supply and demand curves are derived from fundamentally different motivations than goods market curves — labour supply reflects workers' trade-off between income and leisure (backward-bending), while labour demand is a derived demand based on the marginal revenue product of labour. This makes the labour market unique in its structure and behaviour.

The key difference lies in what drives the shape and position of each curve. In the goods market, demand comes from consumers wanting utility from the good itself, and supply comes from firms wanting profit from producing it. In the labour market, the roles flip in a crucial way.

Labour demand is a derived demand — firms hire workers not because they value labour directly, but because labour produces output that can be sold. So the demand curve for labour is based on the marginal revenue product (MRP) of labour: the extra revenue a firm earns from hiring one more worker. This MRP depends on both the worker's physical productivity and the price of the output. As more workers are hired, diminishing returns set in, so MRP falls — giving the labour demand curve its downward slope. This is similar in logic to a goods market demand curve (both slope downward), but the reason is different: goods demand falls because of diminishing marginal utility; labour demand falls because of diminishing marginal product.

Labour supply is where the most striking difference appears. In the goods market, supply curves typically slope upward — higher prices induce firms to produce more. But labour supply comes from individuals deciding how many hours to work, and this decision involves a trade-off between income (which buys goods) and leisure (which is itself valuable). At low wage rates, a wage increase encourages more work (substitution effect dominates). But at high wage rates, the worker may choose to work fewer hours and enjoy more leisure, because the same income can be earned in less time (income effect dominates). This produces a backward-bending labour supply curve — a shape that has no parallel in the goods market.

Watch out

A common mistake is to think labour supply always slopes upward like a normal supply curve. In reality, for higher wage levels, the curve bends backward — a phenomenon unique to labour markets. …

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