Examples of Necessities vs. Luxuries and Their Demand Elasticity

📚 Quick Study Guide

• 🍎 Necessities: These are goods and services consumers need to survive (e.g., food, water, shelter). They have inelastic demand.
• 🏠 Luxuries: These are goods and services that are desired but not essential (e.g., designer clothes, fancy cars). They have elastic demand.
• 📈 Price Elasticity of Demand (PED): Measures how much the quantity demanded of a good changes in response to a change in its price. The formula is: $PED = \frac{\% \ Change \ in \ Quantity \ Demanded}{\% \ Change \ in \ Price}$
• 📏 Inelastic Demand: When PED is less than 1 (absolute value), demand is inelastic. A change in price has a small effect on quantity demanded.
• 🛋️ Elastic Demand: When PED is greater than 1 (absolute value), demand is elastic. A change in price has a large effect on quantity demanded.
• ⚖️ Factors Affecting PED: Availability of substitutes, proportion of income spent on the good, and time horizon.

🧪 Practice Quiz

1. Which of the following is the BEST example of a necessity?
   1. Designer Handbag
   2. Luxury Sports Car
   3. Basic Staple Foods
   4. Premium Cable TV
2. Which of the following goods is MOST likely to have inelastic demand?
   1. Diamonds
   2. Gasoline
   3. Vacation Packages
   4. Restaurant Meals
3. If the price of insulin increases by 10% and the quantity demanded decreases by 2%, what type of demand does insulin have?
   1. Elastic
   2. Inelastic
   3. Unit Elastic
   4. Perfectly Elastic
4. Which of the following is the BEST example of a luxury good?
   1. Tap Water
   2. Generic Brand Cereal
   3. Private Jet
   4. Over-the-counter Pain Relievers
5. If a product has many close substitutes, its demand is MOST likely to be:
   1. Inelastic
   2. Elastic
   3. Perfectly Inelastic
   4. Perfectly Elastic
6. A good that represents a small portion of a consumer's income is MOST likely to have:
   1. High Elasticity
   2. Low Elasticity
   3. Unit Elasticity
   4. Perfect Elasticity
7. Which of the following scenarios would MOST likely result in a DECREASE in the elasticity of demand for a product?
   1. More substitutes become available.
   2. The product becomes more of a necessity.
   3. The time horizon considered increases.
   4. The product becomes a larger portion of the consumer's income.