People used to spent their money in restaurants, bars, cinemas, theaters, parties, festivals, massages, hairdressers, and a bunch of other services. If you add lockdowns, many things happen:
* people have leftover money, that they instead spend on "things"... and since they're used to using less services, this is also true for some time after the lockdowns
* If you're stuck at home, you'll buy stuff that makes that nice... a better tv, a game console,...
* Some lockdown policies directly affect your 'need for stuff' - school from home? Kids need their own PCs, you need to buy a scanner and a printer for them,...
* People working from home also have more free time, and decide to do the long delayed house work and projects - so people buy more construction materials (also people want houses outside of cities, because it's nicer to be there during lockdowns), so prices of that go up too
* and last but not least, manufacturers fuck up their orders, don't have stock buffers, and fail horribly