And my point was that even UBI falls over when someone gets their UBI taken away by a fine. Starving is starving.
So if you get a parking ticket (presumably <1% UBI), you can just pay it, but if you get a large fine (20% UBI), you'd pay it off in two monthly payments of 10% each.
You'd probably need something in place to intervene if someone's constantly paying 10% every month due to multiple fines to prevent people racking up daft amounts of fines and just 'living on 90%'
Everyone has a slightly different demand elasticity for certain goods. To use myself as an example, I would buy the same amount of coffee if the price doubled tomorrow, but someone else may choose to cut back on their coffee consumption.