Some Americans will receive a second Social Security check this week

Some Americans will receive two Social Security payments this week, a rare occasion that is the result of a quirk in the system. 

Typically, the Social Security Administration sends out just one payment each week, delivering Social Security checks on the second, third and fourth Wednesdays of each month. Then it pays Supplemental Social Security Income — which provides support for disabled people and older Americans with low incomes — on the first of the month unless it falls on a weekend o