I see the point you are trying to make, but inflation doesn’t quite when that way.
Comparing the prices of the same commodities at two different points in time is literally how inflation is calculated, the increase from $1.50 to $4 is real.
Now, what the inflation-adjusted dollars are telling you is that if eggs had only increased in price commensurate with general inflation, they would have gone from $1.50 to $2. The extra $2 increase is above what a consumer would expect given the general increase in the prices of everything else. If someone (magically) had a salary that increases with inflation, they would find eggs today to be a larger fraction of their spending if they kept the same level of consumption.
Eggs are more expensive both in absolute and relative to other products. The reasons for this are complex, but due in no small part to people continuing to buy large quantities of eggs even when they were heinously expensive in the early days of the pandemic. The market absorbed that information and came to the conclusion that eggs were previously undervalued.
Intentionally did not talk about Vance, I was merely responding to the idea that using past prices adjusted for inflation compared to current prices isn’t that straightforward.
Thanks for the lecture, appreciate the tone.