It's a little less expensive, but I wouldn't call it "far" less expensive unless you're prepared to stick to the lowest-cost ingredients like rice and beans.

In my area, cooking for myself, my weekly supermarket food bill is about £30 (~$40) and that lets me eat pretty well. For comparison, a medium-sized delivery pizza is £17 (~$22).

So I'd be looking at about 4x the cost if I ate a delivery pizza every day.

How do the figures compare in your area? Is delivery food radically cheaper?

I'm in Chicago, so $22 is almost the cost of a medium deep dish pizza, and I can stretch that to almost a week of dinners if it's just me.

A couple of footnotes: 1. Pizza is absurdly cheap, even for takeout food. I don't really understand how that works. 2. I prefer takeout over paying for delivery, which saves a lot. My favorite pizza places are in walking distance.