I. Statistical findings, 381; changes in the marginal productivity of labor in the subsistence sector, 381; changes in the wage rate in the subsistence sector, 384; relationship between the wage rate and marginal productivity in the subsistence sector, 387; elasticity of labor supply to the capitalist sector, 388; changes in the subsistence sector labor force, 390; concluding remarks, 394. — II. Examination of statistical studies by other writers, 395; comments on Fei-Ranis' conclusions, 395; comments on Jorgenson's conclusions, 398.— Appendix A: cross-sectional test of the marginal productivity theory, 400.— Appendix B: mathematical examinations of the changes in the capital-labor ratio, labor productivity, and the capital-output ratio, 401.