Answer:
A)) hamburgers and ketchup are complements.
Explanation:
These are options
A) hamburgers and ketchup are complements.
B) hamburgers and ketchup and substitutes.
C) hamburgers and ketchup are normal goods.
D) hamburgers are normal goods and hot dogs are inferior goods.
From the question were told that " when the price of hamburgers decreases, the Ruiz family increases ketchup purchase"
In this case we can say that to the Ruiz family, hamburgers and ketchup are complements.
Complementary goods or services in economics are described as goods that are different but they add values to each of themselves, the consumer do consume both of them depending on when the price of one goes up, the consumer settle for the other one.
