Case Study

Equilibrium Calculation Review

An economic analyst is tasked with finding the equilibrium point for the local wheat market. The market's demand is described by the function Qd=50020PQ_d = 500 - 20P, and the supply is described by Qs=50+30PQ_s = 50 + 30P, where P is the price per bushel and Q is the quantity in thousands of bushels.

The analyst submits the following calculation: Step 1: Set functions equal: $500 - 20P = 50 + 30P Step 2: Solve for Q: $450 = 50Q, so Q=9Q = 9. Step 3: Substitute Q back into the demand function: $9 = 500 - 20P, so $20P = 491, and P = \24.55. Conclusion: The equilibrium quantity is 9,000 bushels and the equilibrium price is \24.55.

Identify the fundamental error in the analyst's methodology. Then, perform the correct calculation to find the actual equilibrium price (P*) and quantity (Q*).

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Updated 2025-08-11

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