Class 12 Economics (Part A – Introductory Microeconomics) – Chapter 4 Theory of Firm under Perfect Competition (पूर्ण प्रतियोगिता के अंतर्गत फर्म का सिद्धांत) October 7, 2025 by manycubs Complete notes on perfect competition, AR-MR relationship, short-run and long-run equilibrium of a firm with bilingual explanations for Class 12.