Wont hurt if you know - I

I was just reading some financial/business jargon and I realized there are so many of them. Many a times I read up on them - wikipedia/investopedia do help a lot :-) - but after sometime I forget or I am just left with a faint idea of what those terms mean. So I am going to give a small introduction - most probably an excerpt from some other website with due acknowledgments - and will not limit myself to technical/management/financial jargon. Any term of interest with due ability to interest people will not be turned back from the door.

Herfindahl-Hirschman Index or HHI or H Index : a measure of the size of firms in relationship to the industry and an indicator of the amount of competition among them. It is an economic concept but widely applied in competition law
and antitrust. It is defined as the sum of the squares of the market
shares of each individual firm. As such, it can range from 0 to 1
moving from a very large amount of very small firms to a single monopolistic
producer. Decreases in the Herfindahl index generally indicate a loss
of pricing power and an increase in competition, whereas increases
imply the opposite. (From Wikipedia)

Gini coefficient: a measure of statistical dispersion most prominently used as a measure of inequality of income distribution or inequality of wealth distribution. It is defined as a ratio with values between 0 and 1: the numerator is the area between the Lorenz curve
of the distribution and the uniform distribution line; the denominator
is the area under the uniform distribution line. Thus, a low Gini
coefficient indicates more equal income or wealth distribution, while a
high Gini coefficient indicates more unequal distribution. 0
corresponds to perfect equality (e.g. everyone has the same income) and
1 corresponds to perfect inequality (e.g. one person has all the
income, while everyone else has zero income). The Gini coefficient
requires that no one have a negative net income or wealth. (From Wikipedia)

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