What causes the deadweight loss that is associated with a monopolistically competitive market

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In a monopolistically competitive market, firms have some market power and can charge prices above marginal cost. This leads to a deadweight loss as the price exceeds the efficient level where marginal cost intersects with demand. Therefore, option B (price exceeding marginal cost) causes the deadweight loss. Options A, C, and D do not explain the cause of deadweight loss in monopolistically competitive markets.

What Causes the Deadweight Loss That Is Associated with a Monopolistically