The diagram shows the demand and supply curve of labour for a firm. The initial wage rate is given by W₀ and the equilibrium quantity of labour employed is L₀. A trade union that represents all of the workers negotiates a rise in wage rate to W₁. [Diagram of labour market with wage rate on y-axis, quantity of labour on x-axis, D and S curves, W0, W1, L0, L1, L2] What is the amount of unemployment that results from this wage rise?

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