A Defined Benefit (DB) pension plan is a plan in which workers accrue pension rights during their time at a firm and upon retirement the firm pays them a benefit that is a function of that worker's tenure at the firm and of their earnings.[10] In other words, a DB plan is a plan in which the benefit on retirement is determined by a set formula, rather than depending on investment returns. Government pensions such as Social Security in the United States are a type of defined benefit pension plan. Traditionally, defined benefit plans for employers have been administered by institutions which exist specifically for that purpose, by large businesses, or, for government workers, by the government itself. A traditional form of defined benefit plan is the final salary plan, under which the pension paid is equal to the number of years worked, multiplied by the member's salary at retirement, multiplied by a factor known as the accrual rate. The final accrued amount is available as a monthly pension or a lump sum, but usually monthly.