Principle of competitive exclusion of Gause (1934) states that each
niche supports only are species. If there are two species having similar
functional status. only tho superior will remain in the niche while the
other is excluded. However, if the niche is large, it may accomodate
two or more species. Of course the superior species will dominate the
niche while the less efficient will remain fewer in number. If the
superior species has small population, the lesser efficient species can
increase its number. The phenomenon is called competitive release.
Principle
of competitive exclusion is related in human society to such positions
which are occupied by single persons, e.g., captain of a team, office
incharge, top scorer in the class. If you want to be topper, choose your
field carefully where you can specialize and become superior to others.
However, in those fields whose niches are large to accomodate several
persons (e.g., intake of engineers in one year), a large number of
persons would be selected as these is competitive release. However, the
number is always limited. Here, again one should specialize in a field
where one can reach the number to be selected.