B3. In a constant cost and perfectly competitive industry, the short-11m equilibrium is at price P0 with industry output Q0 in which every competitive rm produces output an and earns zero prots (point a in the graphs provided on next page). Add whatever necessaiy to the gaphs in order to help you explain the step-by-step derivation of the long-rim supply curve for this industry. Relate your explanation to the points and curves in the graphs oryau will lose at least half the marks