Draw a perfectly inelastic demand curve and state its elasticity. 
Definitions:
Instinctive Behavior
An innate, typically fixed pattern of behavior in animals in response to certain stimuli.
Nicotine
A potent chemical found in tobacco plants that acts as a stimulant in the human body and is highly addictive.
Yerkes-Dodson Law
A theory suggesting that there is an optimal level of arousal for best performance on a task, with both very low and very high levels of arousal leading to poorer performance.
Exciting News
Information that triggers a strong positive emotional response due to its unexpected, interesting, or beneficial nature.
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