The problem is analogous to that which arose at the beginning of the twentieth century, when rapid productivity growth in agriculture forced labor to move from rural areas to urban manufacturing centers. With a decline in farm income in excess of 50% from 1929 to 1932, one might have anticipated massive migration.
这一问题与20世纪初的问题非常相似，当时，农业生产力的快速增长将劳动力从农村地区逐出，驱赶到城镇制造业中心。1929—1932年，农业收入下降了50%以上，你可能会认为这会导致大规模移民。但工人被“困”在了农业部门：他们没有迁徙的本钱，同时，下降的收入大大恶化了总需求，以至于城镇/制造业失业率也出现了飙升。