WEP

This is a very good article which explains, in common language, the reason for the Windfall Elimination Provision (WEP). WEP may be called "double dipping" in common terms.

The article also gives an overview of how Social Security provides a better "rate of return" to low income workers.

Excerpts :

But in a nutshell, I can tell you that Maria’s $1,150 benefit represents about 90 percent of her average lifetime monthly wage. Whereas Frank’s $2,400 Social Security check is probably about 40 percent of his average monthly pre-retirement income.

About 40 percent of public school teachers aren't covered by Social Security. In other words, teachers in 15 states aren't covered by Social Security. In these states, teachers don't pay Social Security taxes, and instead rely on state-run pensions.

This is a good article which looks at Social Security's Windfall Elimination Provision (WEP). The WEP is intended to reduce "double dippling" of pension and Social Security benefits.