What does unshackled mean in Cookie Clicker?

What does unshackled mean in Cookie Clicker? To “unshackle” is merely to add that tier of upgrades to a list that boosts productivity more than the original upgrade ever did. This is used IN TANDEM with “unshackling” each production unit type (portals, banks, the rest).

To “unshackle” is merely to add that tier of upgrades to a list that boosts productivity more than the original upgrade ever did. This is used IN TANDEM with “unshackling” each production unit type (portals, banks, the rest).