Which of the following is not true about surrogate keys?

A) They are identifiers that are supplied by the system, not the users.
B) They have no meaning to the users.
C) They are non-unique within a table.
D) They can be problematic when combining databases.

C

Business

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_____ may also occur when higher-cost external producers are replaced by lower-cost external producers within the free trade area.

a) trade creation b) a customs union c) trade diversion d) a common market

Business

A company looking for venture capitalist funding is deciding on the design of its operating system (OS) for its new phone. The first option is to simply buy the OS from another company

This would result in sales of either 10,000 units if the market is not crowded with similar phones, or sales of only 3,000 units if the market is crowded. If the company decides to design its own OS, the phone would have sales of 70,000 units if the OS was popular, but sales of only 2,000 if the OS was a failure. Suppose that to recoup the cost of designing their own OS the company would need to sell twice as many phones as when they simply buy the OS for the profit from the scenarios to be equal. Which option should the company choose if the probability that the market is crowded is 50% and the probability that the OS is popular is 75%?

Business