This economics question tests your understanding of economic models and analysis. The step-by-step answer below applies the relevant framework and explains the reasoning.
In a competitive labour market, the wage rate is usually determined by:

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Answer
C
Step 1: In a competitive labour market, the wage rate is determined by the equilibrium price where the demand curve for labour intersects the supply curve of labour.
Step 2: Option A (decrease in supply of labour) shifts the supply curve but does not determine the wage rate on its own.
Step 3: Option B (increase in demand for labour) shifts the demand curve but does not determine the wage rate on its own.
Step 4: Option D (the number of buyers and sellers in the market and the productivity of labour) relates to market structure and factors affecting demand, but not the direct determinant.
Step 5: Option C (interplay of demand and supply of labour) correctly describes the interaction that sets the equilibrium wage rate.
C
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In a competitive labour market, the wage rate is determined by the equilibrium price where the demand curve for labour intersects the supply curve of labour.