What do you mean not taught yet?
I mean those more advanced methods are taught after basic arithmetic. There are plenty of adults that operate primarily with 5th grade math, and a scary number of them do finances…
limits of accuracy
This isn’t about limits of accuracy, we’re working with abstract values and ideal systems. Any inaccuracies must be introduced by those systems.
If you think the system isn’t at fault here, please show me how basic arithmetic can make 0.999… into 1. Show me how the carry method deals with Infinity correctly. If every error is just using the system incorrectly, then a correct use of the system must be applicable to everything, right? You shouldn’t need a new system like algebra to be correct, right?
You underestimate how little people think when purchasing things. None of this would be a problem if everyone looked at the price per 100g first, but ooo 3 $5… And then the size reduction usually goes alongside a packaging change, like jumbo or family size; “New look, same great taste!”. It’s all a distraction, out of sight, out of mind and all that.
Also, the 330ml cans are taller, and because of the square-cube law they only need to be a little skinnier to be smaller. They’re also not usually displayed next to the normal 355ml cans. Out of sight…
Also, who is going to laude a big corp product for a logistics change in the first place? I barely see anyone complaining about shrinkflation for packaging reasons as it is. I’d see a better slack fill level on one product and think, “This must be old stock” or “This is the last time we’ll get bags this dense”.