Use the following to answer question: 
-(Figure: The Demand for e-Books) If the price of e-Books decreases from $6 to $4,total revenue _____,which means that demand is _____.
Definitions:
"I Feel Fine"
A common expression indicating the speaker perceives themselves to be in good health or without problems.
Clarifying
The process of making something less confused and more clearly comprehensible.
NSAID Medications
Nonsteroidal Anti-Inflammatory Drugs that are used to reduce inflammation and relieve pain and fever.
Severe Allergy
A critical immune system reaction to a particular allergen that can result in life-threatening symptoms.
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