Roemer's law
In health policy, Roemer's law may be expressed as "in an insured population, a hospital bed built is a bed filled." The rule was deduced by the American health services researcher Milton Roemer, working at the UCLA School of Public Health. Roemer and colleagues found a positive correlation between the number of short-term general hospital beds available per 1,000 population and the number of hospital days used per 1,000 population.