In
the 1970s and 1980s employment in
quintessentially middle-skilled, middle-income
occupations—salespeople, bank clerks,
secretaries, machine operators and factory
supervisors—grew faster than that in
lower-skilled jobs. But around the early
1990s, something changed. Labor markets
across the rich countries shifted from a world
where people’s job and wage prospects were
directly related to their skill levels. Instead,
with only a few exceptions, employment in
middle-class jobs began to decline as a share of
the total while the share of both low- and
high-skilled jobs rose (see chart). The pattern
was similar in countries with very different
levels of unionization, prevalence of collective
bargaining and welfare systems. This
“polarisation” of employment almost certainly
had a common cause.The development of information technology (IT) is the leading candidate. Computers do not directly compete with the abstract, analytical tasks that many high-skilled workers do, but aid their productivity by speeding up the more routine bits of their jobs. But they do directly affect the need for people like assembly-line workers or those doing certain clerical tasks, whose jobs can be reduced to a set of instructions which a machine can easily follow (and which can consequently be mechanized). At the other end of the employment spectrum, as the example of the towel-folding robot neatly demonstrates, low-skilled jobs may not require much education but they are very hard to mechanize.
Source: The Economist, 11 September 2010, p. 95.




