The Washington Post Is a Mess: Social Security Edition | Beat the Press:
"This upward redistribution is important to Social Security for two reasons. First, it has shifted a large amount of wage income to workers earning above the cap. The share of wage income that has escaped taxation in this way rose from 10 percent in 1983 to 18 percent in recent years. Similarly, the shift from wage income to profits in the last 14 years has also deprived the system of revenue."
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