Why? Why do we have to learn this???

The answer is D

Explanation:

because at that point Cuba was acting up and becoming communists and the USA was not having it.

add the answer choices and i'll give you the answer

changes in factors like average income and preferences can cause an entire demand curve to shift right or left. this causes a higher or lower quantity to be demanded at a given price. demand curves relate the prices and quantities demanded assuming no other factors change. it is important for consumers to know this information, because it is crucial for them to know what they can afford and can't afford. i hope this .