Answer:
The 3-Legged Stool Metaphor
Social Security benefits were said to be one leg of a three-legged stool consisting of Social Security, private pensions and savings and investment. The metaphor was intended to convey the idea that all three approaches were needed to provide stable income security in retirement.
Step-by-step explanation:
The U.S government could also be known as The three branches of the U.S. government are the legislative, executive and judicial branches.
That's my answer anyway.