What was the economic result of demobilization in 1920 America on farm boys who had seen the world and big cities?

One of the intriguing effects of both the return from
soldiers who had seen Europe as well as the general beginning of mechanization on the
farm from the 1920's continuing even to the present is the change in the necessity of
human labor on the farm and the change as well in the profitability and sustainability
of farming models.

Of course there were the psychological
effects of boys who had seen Europe and may have wanted a more cosmopolitan life than
was available down home on the farm, but the economic effects of the changing world on
the farm were far more far-reaching and devestating depending on your
outlook.

As tractors and other mechanical aids became more
and more common after the war (and cheaper thanks to some of the surplus tank treads and
research that went into those machines) more and more farmers began to mechanize which
led to consolidation and a drive towards crop yield as the main measure of success as
opposed to perhaps quality or consistency.  The long-reaching effect is the transition
to the factory farm and the migration of a great deal of labor from the farm fields to
the cities.