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The Bank is an auxiliary building for Power Sales. It does not sell anything on it`s own, but improves the sales in adjacent tiles. It goes without saying that all viable adjacent tiles of a Bank should contain Offices.

The description in-game says that Bank improves sales by 2.5 times, but this is a misleading statement. What bank really does is add 1.5 times sale power of a building to it, flatly. So an office that has one bank next to it will sell 2.5 times the power. An office with two banks, however, will sell even 4 times, not 6.25 as one might expect.

To sum it up...

Number of banks 1 2 3 4
Improvement, times 2.5 4 5.5 7
However, the flat nature of bank`s boost does not change the most lucrative strategy with the bank - each office should have as many banks surrounding it as possible. As shown on example below, a checkerboard pattern gives the most potent selling power improvement.
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