What Type of Primary Key Is System-Generated and Is Usually

question 49

Multiple Choice

What type of primary key is system-generated and is usually hidden from users?

• A) weak entity
• B) surrogate key
• C) natural key
• D) artificial key

---

Definitions:

Four-Firm Concentration

A measure of market concentration that evaluates the total market share of the four largest firms within an industry.

Standard Oil Case

A 1911 antitrust case in which Standard Oil was found guilty of violating the Sherman Act by illegally monopolizing the petroleum industry. As a remedy the company was divided into several competing firms.

Microsoft Case

A 2002 antitrust case in which Microsoft was found guilty of violating the Sherman Act by engaging in a series of unlawful activities designed to maintain its monopoly in operating systems for personal computers; as a remedy the company was prohibited from engaging in a set of specific anticompetitive business practices.

U.S. Steel Case

The antitrust action brought by the federal government against the U.S. Steel Corporation in which the courts ruled (in 1920) that only unreasonable restraints of trade were illegal and that size and the possession of monopoly power were not by themselves violations of the antitrust laws.