Which of the following would cause a demand curve for a good to be price inelastic? a. There are a great number of substitutes for the good. b. The good is a necessity. c. The good is a luxury. d. The good is inferior.

To determine which factor causes a demand curve for a good to be **price inelastic**, let's analyze each option: a. **There are a great number of substitutes for the good.** - **Effect:** **Elastic Demand** - **Reason:** When many substitutes are available, consumers can easily switch to alternative products if the price of the good rises, making the demand more sensitive to price changes. b. **The good is a necessity.** - **Effect:** **Inelastic Demand** - **Reason:** Necessities are essential goods that consumers need regardless of price changes. As a result, the quantity demanded doesn't decrease significantly when prices rise, leading to inelastic demand. c. **The good is a luxury.** - **Effect:** **Elastic Demand** - **Reason:** Luxuries are non-essential goods, and consumers are more likely to reduce their consumption if prices increase, making the demand more sensitive to price changes. d. **The good is inferior.** - **Effect:** **Varies (Generally Elastic or Inelastic)** - **Reason:** Inferior goods are those for which demand increases when consumer income decreases. The price elasticity of inferior goods can vary and is not inherently inelastic or elastic. **Conclusion:** The factor that causes a demand curve to be **price inelastic** is: **b. The good is a necessity.** **Answer:** b. The good is a necessity.