Which of the following scenarios will not shift the demand curve for a particular product?

Q. Which of the following scenarios will not shift the demand curve for a particular product?

• A change in the income of the consumers of that product
• Effective advertising campaign by producers of a substitute good
• A reduction in the price of the raw material for that product
• A widely publicised study that says the product is harmful to the health of consumers

Answer: A reduction in the price of the raw material for that product