Library Fines and Regulation
This is a growing movement for public libraries to slash overdue book fines. (My local library just reduced its fines by half.) The rationale for this change is that fines impose a disproportionate burden on poor patrons and tend to discourage them from borrowing. A more effective (and distributively neutral) approach is to impose short suspensions of borrowing privileges on people who keep on returning books late.
I wonder if there is an insight here for other areas where fines or damages are used to regulate behavior. Bail is a good example, as there is increasing interest in bail reform motivated by the fact that bail operates in a manner that discriminates against the poor (i.e. bail is being set too high for many criminal defendants).