Because the corporations are saying it is an increase in costs that are driving higher prices, not demand. And the price curve for things like "eggs" is not being driven by demand.
It could be when all the brands are owned by a couple of corporations, which are chaired by a couple of large investment firms.
You know for a fact that big tech was doing a no poaching agreement in 2005, but can't wrap your head around the fact that corporations can collude on a price hikes in 2023?