This presentation discusses labour and wages. It defines labour as any physical or mental work done for compensation. Labour is an essential factor of production. Wages refer to the monetary compensation paid to employees for work. The document then examines theories of wage determination. The marginal productivity theory states that wages are determined by a worker's marginal product. Wages will equal the value of their marginal product. However, this theory makes unrealistic assumptions and ignores other factors like unions that influence wages. Modern theories see wages as determined by the interaction of labour demand and supply in the market.