Suppose there is racism on the part of the real estate agents; they don't work as effectively for black clients as for white clients in the same neighborhood. S

Suppose there is racism on the part of the real estate agents; they don't work as effectively for black clients as for white clients in the same neighborhood. So white and black clients in the neighborhood get taxed based on the average sale price -- which benefits whites (because it is less than they can sell their house for) and harms blacks (because it is more than they can sell their house for.) Or similarly, if buyers are racist the same kind of dynamic could take place. In either case, though, it doesn't seem as though the assessors are doing anything wrong, unless we want them to start taking the race of the owner into account when they do their assessments.