[IanCal]

Hmm, there were many things in the UK that used to have essentially rental kind of options that were much more expensive in the long run (TVs and sofas) as well as energy being more expensive if you were poor (prepayment meters). The last one is still true, but much more limited now.

You don't need starvation level poverty though, remember the comparison point is with a salaried captain of the police. So if the point was "they don't spend more because they can't buy any shoes" it doesn't relate to the original Pratchett bit.