Let me ask you something. Do you work for a company that packages consumer goods? Have you ever been in a meeting where package sizes are discussed and numbers and market research analyzed? I have.
Nope, i'm on the consumer side of packaged products, but I know the difference between a package for $1.00 that contained six items a year ago, but now contains five.
You should listen to Rush Limbaugh talk about the price controls of the Nixon era.
20% loss of material with no reduction of price is ~20% inflation.