Boots theory
Boots theory is the idea that being poor is expensive. It comes from a Discworld novel, where a character observes that being poor, he can’t afford a good pair of boots. Instead he buys cheap boots that don’t last nearly as long. The cheap boots cost less money upfront, but are ultimately more expensive since they frequently need replacement.
Taken literally, I’m not sure how accurate the story is. Is it really true that cheap boots are less efficient in durability than expensive boots? It could be, but the cost of boots might also be driven by characteristics besides durability, such as comfort or appearance. Hard to say, since I don’t wear boots.
But if we forget about the boots, then boots theory is obviously true. The boots represent capital. Capital is anything that costs resources now, and provides value later. Capital costs money. If you can’t afford to buy capital, then you ultimately lose out on the value of capital. Being unable to afford capital is therefore expensive.