Present status of the concept of unemployment, 1. — Willingness to work: gross and net unemployment, 7; statistical indications for 1940, 11. — Employability: marginal employables, 13; legal unemployables, 14; cumulative unemployment, 15; institutional unemployables, 18. — Suppressed unemployment: part-time unemployment of wage workers, 19; part-time unemployment of non-wage earners, 20; unproductive employment, 20; statistical estimates, 21. — Summary of statistical approximations, 25. — Recommendations for improving current estimates, 27. — Conclusion, 28.

Definition of direct tax effect, 638. — The theory of the firm, 639. — Diagrammatic presentation, 642. — The tax ratio, 644. — The tax ratio as a variable: a progressive tax, 646. — Comparison of tax effects and interest effects, 647. — The tax ratio as a constant: a proportional tax, 649. — Plans of more than two years' duration, 650. — Effects of the tax on other economic parameters, 652. — Implications for the theory of investment, 653. — Other implications, 654.