Market Equilibrium and Consumer/Producer Surplus - AP Microeconomics

1. Find the equilibrium quantity if demand is $Q_d = 50 - P$ and supply is $Q_s = 2P$.

   Equilibrium quantity $Q = 20$. Substitute $P = 10$ into either equation to find $Q$.

2. What is market equilibrium?

   Market equilibrium is where quantity demanded equals quantity supplied. This occurs when market forces balance supply and demand.

3. State the formula for consumer surplus.

   $Consumer surplus = \frac{1}{2} \times \text{base} \times \text{height}$. Area of triangle above price and below demand curve.

4. What happens to producer surplus when the price decreases?

   Producer surplus decreases. Lower price reduces the area between price and supply curve.

5. What is the relationship between elasticity and deadweight loss?

   More elastic demand or supply increases deadweight loss. More elastic curves respond more to price changes.

6. Calculate deadweight loss if the tax is $5 and equilibrium quantity decreases by 10.

   Deadweight loss = $25. Formula: $\frac{1}{2} \times \text{tax} \times \text{quantity change}$.

7. Identify the condition for market equilibrium using a graph.

   The demand curve intersects the supply curve. This intersection point determines equilibrium price and quantity.

8. What is the impact of a subsidy on supply?

   Supply increases. Subsidies effectively shift supply curve rightward.

9. Identify the effect of a tax on the equilibrium price consumers pay.

   Price consumers pay increases. Taxes shift effective supply curve, raising consumer price.

10. What happens to producer surplus when demand decreases?

    Producer surplus decreases. Decreased demand lowers price, reducing producer surplus area.

11. What results from a price ceiling set below equilibrium price?

    A shortage occurs. Quantity demanded exceeds quantity supplied at the ceiling price.

12. State the formula for producer surplus.

    $Producer surplus = \frac{1}{2} \times \text{base} \times \text{height}$. Area of triangle below price and above supply curve.

13. What results from a price floor set above equilibrium price?

    A surplus occurs. Quantity supplied exceeds quantity demanded at the floor price.

14. Identify the effect of a subsidy on the equilibrium price producers receive.

    Price producers receive increases. Subsidies effectively increase the price producers receive.

15. Explain the impact of a binding price floor.

    A binding price floor causes a surplus. Price floor above equilibrium prevents market clearing.

16. What is the effect of an increase in supply on equilibrium quantity?

    Equilibrium quantity increases. Higher supply shifts the intersection point rightward.

17. What shifts the supply curve to the left?

    An increase in production costs. Higher costs reduce willingness to produce at every price level.

18. What shifts the demand curve to the right?

    An increase in consumer income or preferences. These factors increase willingness to buy at every price level.

19. Calculate consumer surplus if the willingness to pay is $50 and price is $30.

    Consumer surplus = $20. Simple subtraction: willingness to pay minus actual price paid.

20. What is the impact of an excise tax on supply?

    Supply decreases. Taxes effectively shift supply curve leftward.

21. What is the role of price in a market economy?

    Price signals guide resource allocation. Prices coordinate economic decisions and allocate scarce resources.

22. What happens to consumer surplus when the price decreases?

    Consumer surplus increases. Lower price increases the area between demand curve and price.

23. Which area represents consumer surplus on a supply and demand graph?

    Area above the price level and below the demand curve. Triangle showing benefit from purchasing below maximum willingness.

24. What is the effect of a non-binding price floor?

    No effect; market remains at equilibrium. Price floors below equilibrium don't constrain the market.

25. What does it mean if a market is perfectly competitive?

    No individual can influence the price. All participants are price takers with no market power.

26. Which area represents producer surplus on a supply and demand graph?

    Area below the price level and above the supply curve. Triangle showing benefit from selling above minimum acceptance.

27. What is the effect of a non-binding price ceiling?

    No effect; market remains at equilibrium. Price ceilings above equilibrium don't constrain the market.

28. What happens to consumer surplus when supply increases?

    Consumer surplus increases. Increased supply lowers price, expanding consumer surplus area.

29. What happens to total surplus when a tax is imposed?

    Total surplus decreases. Taxes create deadweight loss, reducing overall welfare.

30. What is deadweight loss?

    Deadweight loss is the loss in total surplus due to market inefficiency. Represents welfare lost when markets fail to reach efficiency.

31. What occurs when a market is in disequilibrium?

    There is either a surplus or a shortage. Markets automatically move toward equilibrium through price changes.

32. Define consumer surplus.

    Consumer surplus is the difference between what consumers are willing to pay and what they actually pay. It measures the benefit consumers receive from purchasing goods.

33. Calculate producer surplus if the willingness to accept is $20 and price is $30.

    Producer surplus = $10. Simple subtraction: actual price received minus willingness to accept.

34. Explain the impact of a binding price ceiling.

    A binding price ceiling causes a shortage. Price ceiling below equilibrium prevents market clearing.

35. What is the effect of an increase in demand on equilibrium price?

    Equilibrium price increases. Higher demand shifts the intersection point upward.

36. Find the equilibrium price if demand is $Q_d = 50 - P$ and supply is $Q_s = 2P$.

    Equilibrium price $P = 10$. Set $50 - P = 2P$ and solve for $P$.

37. Define producer surplus.

    Producer surplus is the difference between what producers are willing to accept and what they actually receive. It measures the benefit producers receive from selling goods.

38. Find the new equilibrium after a supply decrease from $Q_s = 2P$ to $Q_s = P$.

    New equilibrium price $P = 25$. Set $50 - P = P$ to find new intersection.

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