I love when something comes out, let’s say the MacBook Air, and everyone crows about how thin it is. Great, it’s thin. But that’s not the whole story. It still takes up the same footprint in your bag, still has the same size screen, and so on — now it’s just that much more likely to snap in half. This chart, by Rosscott Inc., presents a method for determining the true impact of a gadget on your livelihood.

The final figure will be in smug-feet.