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The mathematical reason why you should always buy the bigger pizza: "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." http://www.npr.org/sections/money/2014/02/26/282132576/74-476-reasons-you-should-always-get-the-bigger-pizza