Question 18

The equilibrium price and quantity occur where the supply and demand curves cross.

Equilibrium price and quantity are established at the point where the supply curve intersects with the demand curve. This intersection signifies the price at which the quantity of goods supplied equals the quantity of goods demanded.

A) Where price and quantity curves cross

This option is misleading because it refers to "price and quantity curves" without specifying supply and demand. The correct concept is the intersection of the supply and demand curves, not just any price and quantity curves.

B) Where the supply and demand curves cross

This is the correct answer, as it accurately reflects the principle of market equilibrium. At this intersection, the amount of goods that producers are willing to sell matches exactly with the amount consumers are willing to buy, thus determining the equilibrium price and quantity.

C) At the intersection of the price and demand curves

This option is incorrect because it only considers the demand curve without accounting for supply. The equilibrium cannot be established by looking solely at the demand curve; it requires the interaction of both supply and demand.

D) At the intersection of the price and supply curves

This choice is also incorrect as it focuses exclusively on the supply curve. Similar to option C, it fails to recognize that equilibrium is determined by both supply and demand interacting with each other.

Conclusion

The correct answer is definitively option B, as it encapsulates the essential economic concept of equilibrium where both supply and demand intersect. Options A, C, and D fail to capture this critical interaction, thus providing an incomplete understanding of how equilibrium is established in a market.