(Figure: Understanding Price Ceilings and Floors) In the graph, a price of $25 would allow for an effective price ceiling. 
Definitions:
Defibrillator
A device designed to deliver an electric shock to a patient, in an effort to stop pulseless ventricular fibrillation or ventricular tachycardia.
Tachycardia
Abnormal rapidity of heart action.
Purkinje Fibers
Specialized fibers in the heart's ventricles that help coordinate the heart's contractions by conducting electrical impulses.
Repolarization
The process by which cells, especially heart and nerve cells, restore their membrane potential to a resting state after depolarization.
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