While playing Tropico 4, I'm noticing that my buildings will occassionally have a "sunburst" appear above them. I'm guessing this is a good thing, but what does it mean?

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While playing Tropico 4, I'm noticing that my buildings will occassionally have a "sunburst" appear above them. I'm guessing this is a good thing, but what does it mean?
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You've moved El Presidente there and he/she is boosting building efficiency. |
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