Olive handcuffs

I have found out that one of the largest olive mills or Frantoi in the area works in the following way.

It itself has no substantial olive groves so relies on many small olive grove owners to sell their olives to them so they can sell olive oil bearing their name. Nothing uncommon about this.

What they do however is not pay for the fruit for 12 months or until the next years harvest. These appalling terms means that the mill owner maximizes his cashflow as the expense of the small olive grove owners who cannot leave and take their fruit elsewhere as they would not be paid for the previous year - olive handcuffs.

Keep the serfs down.