Why does a round pizza come in a square box?

[psychonaut]

@Tim_T-Bonham.net

No, it wouldn’t save cardboard.

The corrugated cardboard is made in long rectangular sheets. Round or octagon boxes would just be cut out of the rectangular sheets, and the corner piece scraps discarded*. So the same amount of cardboard would be used up in making round or octagon boxes.

• These days, the scraps would probably be recycled somehow. But it’s still original manufactured cardboard that gets used up.

Surely there are uses for square pieces of cardboard with a round hole cut out—packing material for large pots, platters, and other crockery, perhaps?