By this point that's allright! Although, recently, not only prices have called our attention, but the fact that they are disproportionate to the amount, content, time, weight, size, etc, anyway, services and products have being modified deliberately. We could say widely opened adultered to profit more by spending less to produce or serve. Despite customers receive less, they are paying more cause the price is readjusted due the human perception in relation to the label, fact which explore mass products and services, taking advantage mainly of the ones who have mathematics quantitative difficults, that are the great part of the consumer society.
Would it be the dark side of Free Market?
It can get even more devious than what you've shown us and can be incredibly wasteful. Think about easter eggs - sometimes the packaging is huge in comparison to the product, full of carefully constructed cardboard with large empty spaces inside. It takes a lot more unnecessary shipping space all through the process (increasing fuel pollution and inflated staffing costs elsewhere). Another particularly hard to spot trick they use is keeping all the packaging and even the price exactly the same, but removing one unit from the product to achieve the same effect, so instead of getting 6 weetbix you get 5 in the shrinkflated version. It even happens when travelling, airlines are constantly trying to rearrange the seating on their plane to trim extra centimeters from seats if allows them to squeeze another row in. The only way you can combat it as a consumer is to limit your buying experiences with companies who take these actions, I personally understand that stuff will slowly get more expensive and would rather pay more than get less.