Some (but not all) politicians are masters of bull shit. Quite often they're easily convinced by their their own bull shit so much that they'll tell the media about it with great fan fair. By quoting BIG numbers they aim to wow us all. However, if we all took a step back and applied a little high school mathematics to things the press and politicians tell us, you'll start to see things with far greater clarity.
You all know more than you think. Pause for thought next you see a big claim and ask yourself, is it big or small?