There can be variations, sometimes large ones, in the prices that hospitals set for the same procedure or service. This difference is due to the many factors that go into determining the cost of hospital services and that each facility has its own set of factors to manage which determines its cost structure. Some organizations have higher cost structures due to the complexity of the service being provided, such as trauma, transplant, or neonatal intensive care, that are extremely expensive to maintain. Some organizations have mission related costs, such as teaching, research, or providing care for low income populations.