Class 12 Economics Chapter 2 Theory of Consumer Behaviour PDF NCERT Solutions for Class 12 Economics. Chapter 2 Theory of Consumer Behaviour. PDF Free Download. NCERT Solutions for Class 12 Economics Chapter 2: Theory of Consumer Behaviour PDF Free Download Chapter 1: Introduction Chapter 2: Theory of Consumer Behaviour Chapter 3: Production and Costs Chapter 4: The Theory of The Firm Chapter 5: Market Equilibrium Chapter 6: Non-Competitive Markets