Many seniors today rely heavily on Social Security to make ends meet. And that's not necessarily a great thing.

The problem with Social Security is that there's a lot of misinformation surrounding it. And one common myth is that benefits are designed to replace workers' pre-retirement paychecks in full.

In reality, for the average earner, Social Security will replace about 40% of pre-retirement earnings. And most seniors need roughly twice that sum to live comfortably.

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Source Fool.com