Suppose demand is given by the equation: 
Using the midpoint method, what is the price elasticity of demand between $7 and $8?
Definitions:
Midbrain
The middle portion of the brainstem that plays a role in vision, hearing, motor control, sleep/wake, arousal (alertness), and temperature regulation.
Epithalamus
A portion of the diencephalon in the brain, involved in linking the limbic system to other parts of the brain and regulating hormones and circadian rhythms.
Habenula
The habenula is a small region in the brain involved in regulating sleep-wake cycles, reproductive behavior, and stress responses.
Pineal Gland
is a small endocrine gland in the brain involved in the production of melatonin, regulating sleep patterns.
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