It just occurred to me why so many companies do this: I'm pretty sure the way inflation is calculated doesn't take these changes in packaging into account. It's a way to slip in price changes without the official inflation numbers being affected.
This is it. Chocolate was the most obvious example. There was an old late night video of some star talking about Cadbury eggs and noticing they were smaller, this was before portion size was a discussion topic, so they claimed people were just getting older and bigger. It wasn't until he put a new egg side by side with an old egg that the difference was impossible to ignore.
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