What about computerization of white collar work as a factor? Minicomputers, such as DEC, started spreading into medium-sized businesses and departments. The wea

What about computerization of white collar work as a factor? Minicomputers, such as DEC, started spreading into medium-sized businesses and departments. The wealthy got the benefits of such but it didn't trickle down to those laid off or who had to go back to school after their job was automated away. Offshoring of manufacturing to Asia also began increasing around that time. Thus, it could be a combination of offshoring and automation.