Less is More... Expensive

Over the last few years, I've noticed that a lot of consumables, particularly food, are getting smaller, yet more expensive. And I'm sure I'm not the only one.
Take Cadbury chocolate, for example. We've all seen the blocks on our supermarket shelves, in enough flavours to keep you standing in the chocolate aisle for a good twenty minutes trying to decide which one to buy. There was a time when most (if not all) of these flavours came in 250 gram blocks, and you'd pay about $3.50 for one. Not anymore.
A year or so ago (not exactly sure when), Cadbury decided to give their blocks new packaging, including a cardboard box (instead of the previous paper wrapping). Lovely, everyone thought, who doesn't love new pretty packaging for their food? However, if you looked closely at the box, a horrifying discovery could be made; Cadbury had shaved the size of their blocks from anywhere between 30 and 60 grams. But they were still charging the same price, if not more (I've seen them for as much as $4.99 in some supermarkets).
How stupid do they think we are?
Moving on... canteens. I remember in the last few years of high school, the price of those Zooper Dooper icy poles skyrocketed from 20 cents to 60 cents. Now I get that we were all struggling to cope with the GST, canteens included, but come on. That doesn't warrant TRIPLING the price of an icy pole (yes, I know it's a cheap example, but it's just the principle of it). I thought that by the time I got to uni, prices would have settled, but no. Every year, they still manage to make things more expensive, but give you less of it (eg. Upping the price of a bucket of chips by 50 cents, but giving you a bucket two thirds the size of the old ones, and giving you 9 chicken chips for $2.50 instead of 8 for $1.60). We're STUDENTS. Don't they realise that we of all people CAN'T afford to be paying more and getting less? Surely there's some sort of regulating association responsible for preventing rip-offs like this? (clearly not. But there should be)
So, will there come a day when we're paying $20 for a single slice of bread? When we have to sell our house to be able to afford lunch from the school/uni/work canteen? Probably not. But it wouldn't surprise me.