What is the service equivalent of an economic 'bad'?
Any labor may be considered as a 'bad' (service) for which you are compensated by the firm by paying you salary/wages.
In modeling labor market, this is generally described in the opposite sense, i.e., consuming leisure. When you work you let go of leisure, which is a good. So that, technically, makes supplying labor (which is a service) as an economic bad.