[Excerpt] In this paper, we shall present a formal theoretical mode with which to analyze the equilibrium allocation of the labor force between labor markets. Our basic premise is that the same kinds of forces that explain the choices of workers between the rural and urban sectors can also explain their choices between one labor market and another within an urban area and are probably made simultaneously. The decision-makers -- be they individuals or family units are presumed to consider the various labor market opportunities available to them and to choose the one which maximizes their expected future income.