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Keep your efficiency over 70% for 10 straight days

(Some claim it can be achieved with 7 gamedays of over 70% sale
Efficient achievement button

Efficient achievement button

rate.)

This means you have to have a selling rate of 70% of the customers or higher for 10 ingame days
This achievement therefor can only be reached early in the game or when you got each and every single item.

Reward: None

Achievements list

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