I wasn't sure if I should ask this here or in the General Pizza Making forum. It's not really a pizza making question but, as I've started making my own pizzas I've noticed that the size (in terms of total area) for a pizza seems weirdly related to the cost. One of my goals with making my own pizza was to save money, so I've been putting a cost on each of my pizzas and when I compare them to actual pizza shops - it seems weird.

I grew up eating Rosati's (Chicago pizza chain) it's

$13.99 for a 12" one topping pizza.

$16.99 for a 16" one topping pizza.

$22.99 for a 20" one topping pizza.

But in terms of size a 16" pizza is almost twice as big as a 12". And the 20" is really close to 3x as big as the 12" - but it costs less than twice as much!

What's the reason for the bigger pizzas being such a better value? I guess you'd have lower per-pizza cost for the box? Or is it a marketing thing where people are more likely to order more than they would have otherwise?

Personally, if they only had a 12" pizza, and I wanted a 20" - I'd end up ordering three