The burger hasn’t changed, the money has gotten more “fiat”.
Concur with the fiat....but the burger has also changed. I can no longer stomach McD burgers while I used to love them. They’ve added a ton of fillers or done something else similar since the 80s and now taste like cardboard.
I distinctly remember going in after a x-country meet and spending $5 for 2 big macs, large fries, soda, and a fish sandwich and having ~15 cents left. So inflation yes.
But the burgers tasted better too. Nowadays I’ll eat at Culver’s or Five Guys, spending a bit extra ....maybe a Wendy’s...otherwise I avoid all the chains.