Answer to Question 1
Assortative mating is the tendency for people to marry within their own socioeconomic class. Wealthy people tend to marry other wealthy people; wealth remains concentrated and this fact contributes to the skewed distribution of wealth.
Answer to Question 2
For a normal good, the income effect reinforces the substitution effect. In other words, if the price falls so that a consumer's real income increases, both the substitution effect and the income effect lead the consumer to increase his or consumption of the good. For an inferior good, the income effect reduces the substitution effect. In this case, when the price of a good falls, the substitution effect leads to an increase in the consumption of the good and the income effect leads to a decrease in the consumption of the good.
Affect.
The distribution of the tarsier.
Distribution and Forms of Precipitation: Rain
Biodiversity and the unevenly distribution on the planet
Income Distribution in the United States, 2009
The Frequency Distribution Curve of a Drug