What's the econ word for "Savings and efficiencies gained via consolidation"? For example, say you had 5 kitchens making cookies in 5 parts of the city.
But, then you bought 1 big kitchen, and moved all of your 5 kitchens to this 1 big location.

Due to mass production, we would expect the 1 big kitchen to operate more efficiently, and use fewer employees.

Is there a name for this in econ?

consolidation efficiencies?
mass production?
If you are looking for term for the reason why the efficiencies occur it would be the increasing returns to scale.