Is it permissible to compensate for a deficit in payment from another customer when the first customer pays an amount less than the fixed price?

Workers must adhere to the price set by the employer, and they are not permitted to change it without his permission. If a worker sells at a price lower than the set price, he guarantees the deficit unless he obtains permission from the employer. As for an increase in price, it belongs to the owner of the establishment, and the workers do not have the right to compensate for any deficit from it. Workers must repent from this action and compensate for what has passed or seek permission from the employer.