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PHYSICAL SCIENCE: The scientific study of nonhuman, nonsociety phenomenon, such as atoms, planets, wildlife, and continental drift. Common disciplines that study these physical phenomenon go by the names physics, chemistry, biology, geology, and astronomy, among others. The primary reason for this entry is to provide a contrast with social sciences, especially economics, that study human behavior and society.

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CONCENTRATION RATIOS

A family of measures of the proportion of total output in an industry that is produced by a given number of the largest firms in the industry. The two most common concentration ratios are for the four largest firms and the eight largest firms. The four-firm concentration ratio is the proportion of total output produced by the four largest firms in the industry and the eight-firm concentration ratio is proportion of total output produced by the eight largest firms in the industry. Concentration ratios are commonly used to indicate the degree to which an industry is oligopolistic and the extent of market control of the largest firms in the industry. A related measure is the Herfindahl index.

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Today, you are likely to spend a great deal of time strolling through a department store hoping to buy either one of those memory foam pillows or a remote controlled train set. Be on the lookout for broken fingernail clippers.
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Much of the $15 million used by the United States to finance the Louisiana Purchase from France was borrowed from European banks.
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Nonlinear Statistical Regression
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