ARNOLD S. RELMAN is professor emeritus of medicine and of social medicine at Harvard Medical School, Boston, and a former editor-in-chief of the New England Journal of Medicine. The views in this column are those of the writer. If you would like to express another viewpoint on this issue, please contact us at www.caringfortheages.com. About two-thirds of U.S. nursing homes are investor owned, mostly by large chains. Most nursing home income is derived from Medicaid and a smaller fraction from Medicare and out-of-pocket private payments. Payments are based on standard per diem charges, although they may vary according to the level of nursing care provided to residents, and, in the case of self-paying residents, by the amenities offered. With payment fixed, facilities generate net income only if they operate with economic efficiency. Everything else being equal, the less they spend on staffing and on service to residents, the more profit they make. A careful study published about 6 years ago in the American Journal of Public Health reported that serious deficiencies in care, found by government inspection, were 40% more frequent in private investor-owned nursing homes than in nonprofit private homes (Am. J. Pub. Health 2001;91:1452–55). Nurse staffing at the investor-owned facilities was 32% lower than in nonprofit facilities. Similar, but less rigorous, earlier studies had drawn the same general conclusions. A recent report in The New York Times has added to this evidence. The front-page story in the Sept. 23, 2007, issue reported that after investment companies acquired ownership of for-profit nursing home chains, deficiencies in care found by government regulators increased above the national average. The for-profit chains were selling out to the investment companies as a means of avoiding litigation over their many bad outcomes. Whenever corporate imperatives to generate profit for investors conflict with the requirements for optimum care, as they clearly do in investor-owned nursing homes, there is always the danger that management will cut corners to keep its costs down and maximize net income, thereby jeopardizing the safety of residents. Investor ownership, not just of nursing homes, but of almost any health care facility that is paid on a fixed per diem or per treatment basis, carries this same kind of risk. Their overhead expenses are almost always higher, and to meet investors' expectations, corporate managers must reduce the money spent on staff and services. They do not possess unique skills in cutting corners without compromising patient care, so fixed payment to investor-owned facilities is likely to affect the quality of care. The nursing home story is just one example of the mischief created by investor ownership of health care facilities. Health care should be regarded as a social service, not as a business or industry. Investors invaded the U.S. health care field a few decades ago, in search of profits—not to lower costs to payers, or to improve the quality or accessibility of services. There can be no comprehensive solution to the problems of health care in our country until we restore facilities to nonprofit ownership and replace current market forces with socially responsive regulation.