# How Taxation Affects Perfect Competition and Monopoly ## Step 1: Perfect Competition — Graph and Explanation - **Supply Curve Shifts Up**: A per-unit tax increases each firm's marginal cost, shifting the market supply curve vertically upward by the tax amount. - **Market Outcome**: New equilibrium has a higher price and lower quantity. The tax burden is shared between consumers (higher price) and producers (lower received price). - **Long-Run Effect**: Some firms may exit, but in the long run, remaining firms still earn zero economic profit. **Graph: Perfect Competition with Tax**  *Explanation:* The supply curve shifts up by the tax. Equilibrium price rises, quantity falls. Both consumers and producers share the tax burden depending on elasticities. --- ## Step 2: Monopoly — Graph and Explanation - **MC Curve Shifts Up**: The per-unit tax raises the monopolist's marginal cost (MC to MC+tax). - **Monopoly Adjusts Output and Price**: The monopolist reduces output more than in perfect competition and increases price, often by more than the tax. - **Greater Distortion**: Deadweight loss increases, since monopoly already produces less than the efficient level. **Graph: Monopoly with Tax**  *Explanation:* Tax shifts MC up. The monopolist reduces output further (from Qₘ to Qₜ) and raises price (from Pₘ to Pₜ), shifting more tax onto consumers and increasing deadweight loss. --- ## Final Answer - **Perfect Competition:** A per-unit tax shifts supply up, raising price and lowering quantity, with tax burden shared. Market still efficient in long run (zero economic profit). - **Monopoly:** Tax shifts MC up; output falls sharply, price rises (often more than the tax), consumers bear more burden, and deadweight loss increases compared to perfect competition.

# How Taxation Affects Perfect Competition and Monopoly ## Step 1: Perfect Competition — Graph and Explanation - **Supply Curve Shifts Up**: A per-unit tax increases each firm's marginal cost, shifting the market supply curve vertically upward by the tax amount. - **Market Outcome**: New equilibrium has a higher price and lower quantity. The tax burden is shared between consumers (higher price) and producers (lower received price). - **Long-Run Effect**: Some firms may exit, but in the long run, remaining firms still earn zero economic profit. **Graph: Perfect Competition with Tax**  *Explanation:* The supply curve shifts up by the tax. The equilibrium price rises, and quantity falls. Both consumers and producers share the tax burden depending on elasticities. --- ## Step 2: Monopoly — Graph and Explanation - **MC Curve Shifts Up**: The per-unit tax raises the monopolist's marginal cost (MC to MC+tax). - **Monopoly Adjusts Output and Price**: The monopolist reduces output more than in perfect competition and increases price, often by more than the tax. - **Greater Distortion**: Deadweight loss increases, since monopoly already produces less than the efficient level. **Graph: Monopoly with Tax**  *Explanation:* Tax shifts MC up. The monopolist reduces output further (from Qₘ to Qₜ) and raises price (from Pₘ to Pₜ), shifting more tax onto consumers and increasing deadweight loss. --- ## Final Answer - **Perfect Competition:** A per-unit tax shifts supply up, raising price and lowering quantity, with the tax burden shared. The market remains efficient in the long run (zero economic profit). - **Monopoly:** Tax shifts MC up; output falls sharply, price rises (often more than the tax), consumers bear more burden, and deadweight loss increases compared to perfect competition.