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IMPERFECT COMPETITION: Any markets or industries that do not match the criteria for perfect competition. The key characteristics of perfect competition are: (1) a large number of small firms, (2) identical products sold by all firms, (3) freedom of entry into and exit out of the industry, and (4) perfect knowledge of prices and technology. These four characteristics are essentially impossible to match in the real world.

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VERIFICATION

The hypothesis-testing step of the scientific method in which the hypothesized implication of a theory is compared against real world events and data. This verification can provide support or refutation of the hypothesis. Enough support enables a hypothesis to become a principle. Refutation calls into question the theory implying the hypothesis. In either event, further analysis is indicated.

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APLS

BLACK DISMALAPOD
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Today, you are likely to spend a great deal of time watching the shopping channel looking to buy either one of those memory foam pillows or a remote controlled train set. Be on the lookout for bottles of barbeque sauce that act TOO innocent.
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The 1909 Lincoln penny was the first U.S. coin with the likeness of a U.S. President.
"Failure is the opportunity to begin again, more intelligently. "

-- Henry Ford, automobile manufacturer

PSID
Panel Study of Income Dynamics
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