Maybe they should have to list the exact amount it decreases and the date that manufacturing started the units with the decrease. That well the consumer has all the information they need too know whether they still want to support the company or not.
So once everyone has done it at least once and every item has a warning that the item changed in size without the price, what do we do?
Keep buying, and maybe make an online petition to protest or something, no one will go farther than that.
The warning needs to stay on for two months to keep it relevant.
Maybe they should have to list the exact amount it decreases and the date that manufacturing started the units with the decrease. That well the consumer has all the information they need too know whether they still want to support the company or not.