We investigate whether a social information campaign aimed at reducing water use causes a spillover effect on the use of electricity. On average, water use decreased by 6 percent for the treatment group. We identify a positive spillover effect on electricity use among households that had efficient use of water before the campaign. The effect is sizeable: almost a 9 percent reduction. We argue that these results are consistent with a model of cognitive dissonance where the efficient households infer information about electricity use from the water use information.
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