QUOCTRUNG BUI writes for NPR: Buy the bigger pie. Wanna know why?
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.
So order larger and bring it home, you frugal penny pinchers.