Based on the excerpt from this Discworld book, what other items do you use regularly that would fit in this theory? (Boots and shoes are fair game!)
Text transcript for people who want it:
[The reason that the rich were so rich, Vimes reasoned, was because they managed to spend less money.
Take boots, for example. He earned thirty-eight dollars a month plus allowances. A really good pair of leather boots cost fifty dollars. But an affordable pair of boots, which were sort of OK for a season or two and then leaked like hell when the cardboard gave out, cost about ten dollars. Those were the kind of boots Vimes always bought, and wore until the soles were so thin that he could tell where he was in Ankh-Morpork on a foggy night by the feel of the cobbles.
But the thing was that good boots lasted for years and years. A man who could afford fifty dollars had a pair of boots that'd still be keeping his feet dry in ten years' time, while the poor man who could only afford cheap boots would have spent a hundred dollars on boots in the same time and would still have wet feet.
This was Captain Samuel Vimes 'Boots' theory of socioeconomic unfairness.]
Bonus: suggest ways you can repair/restore your item/other people's items.
House. If you can afford to buy one, it is much cheaper than to pay rent over decades.
Training. If you can afford to not earn money for a few years, training in a valuable skill will earn you much money.
More training. Sometimes you just need to stop earning money for a year.
Tools. It may be hard to choose good tools, some are overpriced for no good reason, but tools you work with instead of working around is a productivity booster.
BTW, this theory has a name in socio-economics, it is called the "poverty trap" (aka "it is expensive to be poor") it is not as much how the rich get richer (there are a lot of more salient mechanisms there) but more about how the poor remain poor.