Buyer Beware: Same Price, Less Product

Am I the only one who's noticed that cereal, candy bars, and ice cream...just to name a few, have gotten smaller, but the price remains the same? Do the people at these gigantic corporations who stock our grocery store shelves think that we don't NOTICE this? They think we're too stupid to notice, that's it. I mean really, look at the ice cream cartons in the freezer section, and tell me why I'm paying the same price for less product. Just sayin'....