 Furthermore, while a number of monitoring services and consumer interest groups take an interest in this form of discrimination, there is very little they can do to change it.Most discrimination based on price occurs in situations without a standardized price list that can be compared against.In the cases of per diem charges, this is easily concealed as few consumers can exchange estimates and work rates, and even if they do the business in question can claim that the services provided had different baseline costs, conditions, etc.