It's also just broadly true about whole categories. For example home ownership. Most poor people rent, which means having a place to live costs them money, but they get nothing for that money as a result, they just need to keep paying forever.

Utilities, in my country people who aren't trusted to pay for electricity, gas, even water (which you need to live!) in arrears have to pay up front for it, so maybe I use 500 kWh of electricity, and I've agreed to pay 20p per kWh = £100, at the end of the month I get a bill for £100 and I settle that a few days later, if I don't eventually I get angry letters and eventually a court summons. That's electricity I used two weeks ago and I won't even pay for it until May. But if I was poor, I might find my best option is I pre-pay £10 to get 40 kWh of electricity. So that 500kWh would cost £120 and I have to buy it first before I use it and if at any time I forget or can't pay the lights go off immediately that my credit runs out.