The highest average income growth was durring the period 1940-1970 rather than the late 1990s
After the end of worlds biggest disaster World war 2 , The US started a leadership in economy amoung some countries
US descovered new technologies
They started to develop new technologies which went far above in the market
This period of age was called GOLDEN AGE for US
US economy grew at an increment of 4%
The new technologies which included the automation was the major sources of income like feedback controllers
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