Essay

Critique of an Equilibrium Calculation

An economics student is analyzing a market where the inverse demand is given by P = 120 - 2Q and the inverse supply is given by P = 20 + 3Q. The student's work to find the equilibrium is shown below:

Step 1: Set inverse demand equal to inverse supply: 120 - 2Q = 20 + 3Q Step 2: Isolate Q terms: 120 - 20 = 3Q + 2Q Step 3: Simplify: 100 = 5Q Step 4: Solve for equilibrium quantity (Q*): Q* = 20 Step 5: Substitute Q* into the inverse supply function: P* = 20 + 3(100) Step 6: Solve for equilibrium price (P*): P* = 320

The student concludes the equilibrium quantity is 20 and the equilibrium price is 320.

Critique the student's work. Identify any errors in their calculation or conclusion. If an error exists, explain the nature of the mistake and provide the correct equilibrium price and quantity, showing your work.

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Updated 2025-08-13

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