In which of the following cases must E be equal to zero? 
Definitions:
Price Elasticity
A measure of how much the demand or supply of a product changes in response to a price change.
Cournot Equilibrium
A model of market competition in which firms choose their output levels simultaneously and independently to maximize profit with the assumption of no further entry by other firms.
Marginal Cost
Marginal cost denotes the change in the total expense incurred by a firm when its output is increased by a single unit.
Major League Baseball
A professional baseball organization consisting of teams in the United States and Canada, representing the sport's highest level of play.
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