The United States has multiple social programs that provide guaranteed minimum incomes for individuals meeting certain criteria such as assets or disability. For instance, Supplemental Security Income (SSI) is a United States government program that provides stipends to low-income people who are either aged (65 or older), blind, or disabled. SSI was created in 1974 to replace federal-state adult assistance programs that served the same purpose. Today the program provides benefits to approximately eight million Americans. Another such program is Social Security Disability Insurance (SSD or SSDI), a payroll tax-funded, federal insurance program. It is managed by the Social Security Administration and is designed to provide income supplements to people who are restricted in their ability to work because of a disability, usually a physical disability. SSD can be supplied on either a temporary or permanent basis, usually directly correlated to whether the person's disability is temporary or permanent.