4. Individuals can receive a Social Security benefit based on their own work record or, if greater, a benefit equal to 50% of their spouse's benefit. There are many details that go into the calculation, but for the purposes of this problem, assume the following points:

Twins A and B earn identical amounts over their careers and receive the same Social Security benefit of $1,000 per month.

Twins A and B die on the same day in the future.

Twin A is married with a spouse receiving $500 per month from Social Security.

Twin B is unmarried for the entire time Social Security benefits are payable.

Did the twins pay the same amount into the Social Security system?

Will the family units for each twin receive the same benefit from the Social Security system?

Discuss the social adequacy and individual adequacy aspects of the benefits paid to the twins.