Early in the program, the payment system was predominantly fee-for-service. Most health providers operate in the private sector and form a competitive market on the health delivery side. However, many healthcare providers took advantage of the system by offering unnecessary services to a larger number of patients and then billing the government. In the face of increasing loss and the need for cost containment, NHI changed the payment system from fee-for-service to a global budget, a kind of prospective payment system, in 2002.