Always Buy the Bigger Pizza

A little advice from Planet Money on how you can maximize your dollar at the pizza joint:

The math of why bigger pizzas are such a good deal is simple: A pizza is a circle, and the area of a circle increases with the square of the radius.

So, for example, a 16-inch pizza is actually four times as big as an 8-inch pizza.

And when you look at thousands of pizza prices from around the U.S., you see that you almost always get a much, much better deal when you buy a bigger pizza.

Is this still a smart approach if you are the type of person who basically finishes the entire pizza that is put in front of him, whatever size that may be?

I'm asking for a friend.