If you are old enough to remember (and if not, ask your granny), think back to the shortages of the late 60's and early 70's (before we joined the EEC/EU).
Sugar
medicines
Loo rolls
Road salt
Fuel
The latest "must have" Christmas toy (shows my age)
White goods
Electronics (and the price will increase)
Wine
..... are all ones that I remember as a kid, but there were many more.
My Grandfather bought a warehouse out in rural Hampshire back in the late 1930's to stock with hard to get items (mostly machine tool related, but it also included enough gin that they took 3 years to sell it off during WWII). My father eventually closed it down in 1976 after we had joined the EEC/EU as there would be no more shortages in his lifetime (which excluding coal in the mid 1980's so he was more or less correct)
I wonder what it would cost to set up the operation again .........