1. Diminishing Returns.- 1.1 Introduction.- 1.2 Restrictions of the Study.- 1.3 Outline of the Monograph.- 2. The Production Technology.- 2.1 Introduction.- 2.2 The Input Correspondence.- 2.3 The Production Function.- 2.4 Properties of the Production Technology.- 2.5 Special Production Structures.- 3. Laws of Bounded Output and Diminishing Average Returns.- 3.1 Introduction.- 3.2 Essential and Weak Limitational Subsets of Factors of Production.- 3.3 Essential and Strong Limitational Subsets of Factors of Production.- 3.4 The Production Axioms and Bounded Output.- 3.5 Law of Bounded Average Returns.- 4. Congestion, Null Jointness and Laws of Variable Proportions.- 4.1 Introduction.- 4.2 Congestion of Production Factors.- 4.3 Properties of OL-, MOL- and OP- Congestion..- 4.4 Null Joint Factors of Production.- 4.5 OP- Congestion and Null Joint Factors of Production.- 4.6 Laws of Variable Proportions.- 4.7 An Empirical Example of Congested and Null Joint Factors of Production ..- 5. The Law of Diminishing Returns at the Extensive Margin.- 5.1 Introduction.- 5.2 Diminishing Returns to Extensive Use of a Production Factor.- 5.3 Holothetic Production Structure and Diminishing Returns to Extensive Use of a Production Factor ..- 6. Standard Notations and Mathematical Appendix.- 6.A Some Standard Notations.- 6.B Mathematical Appendix.- 7. Bibliography.- 8. Subject Index.