Fixing and making things from parts will IMO be very useful ways to earn bits of cash. Or heck, barter.
Oh, then we are set! Nothing is ever thrown away, everything gets cannibalized for use somewhere else and we have quarter-of-a-century old useful things we use every day! We have a collection of obsolete parts to keep our obsolete tools and appliances and toys running.
I am also totally serious when I say that JB Kwik Weld, Gorilla Tape, silicon fusion tape and WD-40 are among our most important storage items.