Click here to read this useful article relevant to AS/AL Economics on Demand for Labour / Wage Determination:
Edexcel spec references –  3.5.1 a) and b) Demand for Labour & 3.5.3 a) Wage Determination
AQA spec references – 4.1.6.1 The demand for labour, marginal productivity theory & 4.1.6.4 The determination of relative wage rates and levels of employment in imperfectly competitive labour markets
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