Economists can't always conduct controlled experiments to test hypotheses about public policy, but sometimes experiments occur naturally. New York City electric rates provide an example. About 1.75 million New York apartments have metered electricity, paying an average of 21 cents per kilowatt hour, among the highest rates in the nation. At the same time, about 250,000 older apartments have unlimited, unmetered electric power included in the rent. A recent article by Sam Dolnick in

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