To better understand Lewis's model of underemployment and its predictions it is helpful to refer to Figure 1. the horizontal dimension of the figure is determined by the labor endowment L of the economy. We will treat total labor supply as fixed,so we will not consider the possibility that,for example, people might work more or less in response to higher wages.
Agricultural employment is measured to the right starting from Oa and industrial (manufacturing) employment Lm is measured to the left starting from Om. the left vertical axis measures the marginal value product of labor in agriculture;the right vertical axis measures the marginal value product of labor in industry, which is assumed to be located in urban rather than rural areas. the prices of agricultural and manufacturing output,Pa and Pm, are assumed to be determined in international markets that economy is too small to influence. this assumption allows us not to consider how the terms of trade between agriculture and industry might change as the relative outputs of the two sectors change. the marginal physical products of labor in agriculture and manufacturing, MPLa and MPLm,