Change in Quantity Demanded vs. Demand Quiz for High School

📚 Quick Study Guide

• 🔍 Change in Quantity Demanded: This is a *movement along* the demand curve. It's caused ONLY by a change in the price of the good itself. Think of it as consumers reacting directly to a price change.
• 📈 Change in Demand: This is a *shift of* the entire demand curve. It's caused by factors other than the price of the good itself, such as changes in income, tastes, expectations, or the prices of related goods (substitutes or complements).
• ✏️ Key Difference: Quantity demanded changes *because* the price changed. Demand changes *because* something *other* than the price changed.
• 🍎 Example: Change in Quantity Demanded: If the price of apples goes down, people buy more apples. This is a change in quantity demanded.
• 🍊 Example: Change in Demand: If a new study shows that oranges prevent colds, people will buy more oranges, even if the price of oranges hasn't changed. This is a change in demand.
• 💡 Mnemonic: Think of 'Quantity' as directly related to 'Price'. If Price changes, it's Quantity Demanded. If anything else changes, it's Demand.

🤔 Practice Quiz

1. Which of the following causes a change in the quantity demanded for a product?
   1. A change in consumer income.
   2. A change in the price of a substitute good.
   3. A change in the price of the product itself.
   4. A change in consumer tastes.
2. If the price of coffee increases, what will happen to the quantity demanded for coffee?
   1. It will increase.
   2. It will decrease.
   3. It will stay the same.
   4. It is impossible to tell.
3. Which of the following will cause a change in the demand for cars?
   1. A decrease in the price of cars.
   2. An increase in the price of gasoline.
   3. A sale on cars.
   4. A change in car manufacturing technology.
4. If consumer income increases, what is likely to happen to the demand for normal goods?
   1. It will decrease.
   2. It will increase.
   3. It will stay the same.
   4. It will fluctuate randomly.
5. Suppose a new study shows that eating chocolate improves memory. What is likely to happen to the demand for chocolate?
   1. It will decrease.
   2. It will increase.
   3. It will stay the same.
   4. It will initially increase, then decrease.
6. The movement along the demand curve is known as:
   1. A change in demand.
   2. A change in quantity demanded.
   3. An increase in supply.
   4. A decrease in supply.
7. If the price of peanut butter decreases, what is likely to happen to the demand for jelly (assuming peanut butter and jelly are complements)?
   1. It will decrease.
   2. It will increase.
   3. It will stay the same.
   4. It will initially increase, then decrease.