How can I show the impact of a NMW on employment using a supply and demand graph?

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You'd need to draw your pair of axes, labelling the vertical one "wages" and the horizontal one "quantity of workers". Your labour demand and supply curves should look like normal demand and supply curves. The National Minimum Wage (NMW) would be a horizontal line above the equilbrium point. This NMW intersects twice with the pair of axes, the distance between both intersections is your excess labour supply - i.e. the number of unemployed workers in this economy.

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