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What might cause a demand curve to shift to the right?

A. A decrease in the product's own price
B. An increase in the price of a complement
C. A decrease in the price of a substitute
D. An increase in the price of a substitute

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Answer:

D. An increase in the price of a substitute

Explanation:

Law of Demand

The law of demand states that as the price of a product of good rises, the quantity demanded for that good or product falls; conversely, if the price of a product or good falls, then the quantity demanded for that good rises.

Given the inverse relationship between the price of a good and the quantity demanded for that good, then its graph will show a downward-sloping demand curve.  

A change in demand represents the leftward- or rightward-shift of the entire demand curve. This may be caused by the following factors:

  • Changes in the income of buyers
  • Changes in consumers' preferences,
  • A change in the price of related goods (substitutes and complements),
  • Number of buyers within a market, and
  • The buyers' expectation on the future prices of goods.  

Types of Related Goods:

Substitutes: two similar goods that fulfill about the same needs or wants of the buyers.

Examples of substitute goods:  Coca-Cola and Pepsi, butter and margarine.  

Complements: these are two goods that are consumed together. When the price of one good goes up, the demand for the complement good declines.

Examples of complements: Tennis racket and tennis ball, ink cartridge and printers.

Answer:

Substitute goods:

If the price of one good rises, then the buyers will demand more of the substitute good with a lower price. This causes a rightward-shift on the demand curve of that substitute good.      

This description matches Option D:  an increase in the price of a substitute.

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