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how the quantity that a person will demand varies depending on the price of a good or service.
Answer:
Quickly is an adverb. It's describing HOW they are doing the verb. ( He finished quickly)
"If my house was burning down, and I had to rescue one thing that wasn't money or important documents, it would be my iPhone! Not only is it slim and lightweight, it never leaves my side and everything I need to accomplish can be done in a touch of a button. It is easier to name off things it cannot do!