Those without insurance or want to change it will have access to a "new insurance Exchange," that is, a new "marketplace" where insurers will offer their plans. This exchange is built on a competitive price system and will include the public option plan. A public option will offer coverage at a cost below that of private insurance plans because of lower administrative costs, bargaining leverage on prescription drugs and possibly lower reimbursements to doctors and hospitals. However, this is a controversial part of the health-care reform. Private insurers are opposed to a public plan, as are Republicans, who say it would be a government incursion into the free market. President Obama has assured that between private insurance and public insurance, there will be real competition, since the "public option" would be self-sufficient and will sustain itself exclusively on insurance premiums that it will be able to collect . The president also declared that no American citizen will be asked to leave their own health insurance and that the public option will be just one among other possible choices.