The formula for the own-price elasticity of demand for a commodity can be written as which of the following? 
Definitions:
Heart Begins Pounding
A physiological response typically associated with intense emotions, stress, or physical exertion, leading to an increased heart rate.
James-Lange Theory
A hypothesis suggesting that emotions are the outcome of physical responses to occurrences.
Two-Factor Theory
A psychological theory that proposes that emotions are based on physiological arousal and cognitive labels.
Cannon-Bard Theory
A theory of emotion that argues that physiological arousal and emotional experience occur simultaneously, but independently.
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