Barbara has just moved into a new apartment and has memorized her new phone number. now she finds that she cannot recall the phone number from her old apartment. she has

Retroactive interference

Explanation:

In psychology, there are some processes that can interfere in our long term memory. One of them is the retroactive interference.

Retroactive interference refers to when you have some difficulties remembering a task you learned before because you now learned a new task. In other words, this new learning interferes with your old memories and the old memories are disrupted.  

In this example, Barbara has memorized her new phone number, she has learned something new but this new learning is interfering with her old memories (her old phone number). Therefore this would be an example of retroactive interference.

good question. i'll be looking into that. (this is a joke sir)

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 .