Reuse marginal thinking from Demand, connect it to Cost & Revenue, then learn to find the profit-maximizing output from tables and graphs. This version also trains the exact graph details and reasoning CISCE examiners repeatedly flag.
MR–MC intuition → two-intersection test → TR–TC maximum gap → graph construction → profit status → short-run loss/shutdown preview → ISC lab
MR vs MC intuition, a full marginal-number walk, producer equilibrium and the two-intersection second-condition trap.
TR–TC method, why TC begins above zero, maximum-profit gap, parallel tangents and the numerical bridge to MR–MC.
Perfect competition, price/output, AC, supernormal/normal/loss, break-even and the shutdown-rule preview.
Examiner-error repair, graph construction, assertion–reason, loss/shutdown cases, numericals and mixed school-paper cases.