economies of scale
the property whereby long-run ATC FALLS as the quantity of output increases.
(more efficient & specialized)
constant returns to scale
the property whereby long-run ATC stays the same as the quantity of output changes.
(output increases exactly in the same proportion in which FOP are increased.)
Diseconomies of scale
the property whereby long-run ATC rises as the quantity of output increases
(inefficient: it starts to cost more to produce an additional unit)