Russian inflation.
I’ve always had a negative reaction to the slow, slightly sneaky reduction in size of a product coupled with an unchanging price. The 3 ounce, 49–cent bag of chips slowly, inexorably becomes a 1 ¾ ounce, 49–cent bag. Most consumers are keyed on price and not quantity, I guess.
Now I learn that this has a name. It’s called “Russian inflation” (*), possibly to reference old Soviet practices.