I can remember the 70s very well. I studied for my O levels by the light of a Tilley lamp, and when I started to buy my own groceries when I lived in a rented house as a student, I can still remember the horror when a jar of coffee went up by about 50% from one week to the next. When you're completely new to it - I was 19 years old, with no knowledge whatsoever of how to look after myself - those kinds of price rises can be quite discombobulating. I don't remember things disappearing, (ye gods, I'm sure I'd remember toilet roll disappearing ) though I definitely remember the five of us pulling together our pennies (literally) to buy a half pint each when the leccy went off. Beer was still hand-pulled.
Oh, about Just In Time: I saw a documentary about the power plant in ... Hull? ... that runs on imported biomass now. If deliveries of the pellets dry up, it has a maximum of about six hours on hand to cope. After that, it shuts down The programme was actually about the socking great ships that transport the pellets across the Atlantic, so I don't know much more than that.