After adjusting income for taxes and transfers, affects that would be least responsible for the reducing percentages of the U.S. population classified like “middle relative income” from 1976 is probably: (1) downsizing and corporate restructuring because of globalization, that has reduced the relative demand for numerous types of skilled physical labor into the United States. (2) reductions in the progressivity of income taxes. (3) high rates of investment in the U.S. economy through foreigners who obtain U.S. currency due to our persistent and growing balance of trade deficits. (4) increases in Social Security and other payroll taxes. (5) technological advances which have accelerated the automation of several forms of industrial production.
Can anybody suggest me the proper explanation for given problem regarding Economics generally?