I'm always amazed that techniques like shrinkflation work (or I presume they work, because if they didn't I assume no one would be doing it!). Do the manufacturers just think that consumers won't eventually notice the reduced amount of product, leading to only short-term gains?

Perhaps more people need to stop buying certain brands out of spite when they try and quietly shrink the packages.

I assume it creates an opportunity for the old formula to arrive at a premium price and packaging.