Refer to the graph showing the demand for books. If the price is changed from $12.00 to $4.00, the quantity demanded increases by: 
Definitions:
Insight
The capacity to gain an accurate and deep intuitive understanding of a person or thing.
Mental Models
Internal representations of reality that people use to understand and interact with the world.
Creative People
Individuals who have the ability to produce original ideas, solutions, or products.
High Intelligence
Refers to a significant level of cognitive capability, including abilities in logical reasoning, problem-solving, abstract thinking, understanding complex ideas, and learning quickly.
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