With a given initial amount of industrial capital, the demand for labour is given by the marginal productivity curve MP1. On the basis of the principle of profit maximisation, at the wage rate OW, the modern sector will employ OL1 labour at which marginal product of labour equals the given wage rate OW. With this the total share of labour i.e. wage in the modern sector will be OWQ1L1 and WQ1D will be the capitalists’ surplus.