In which two cases are composite primary keys particularly useful?
Composite primary keys are particularly useful in two cases:
1 . As identifiers of composite entities, in which each primary key combination is allowed only once in the M:N relationship.
2 . As identifiers of weak entities, in which the weak entity has a strong identifying relationship with the parent entity.
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When marginal cost is equal to marginal revenue, the firm should
A. produce more to increase profits. B. produce less to decrease total costs. C. stop producing additional units to maximize profits. D. provide discounts to encourage purchases. E. intensify distribution to increase sales.
The just-in-time (JIT) system is a(n):
A) management system of people and procedures to fulfill all delivery deadlines. B) production system of small-lot manufacturing to reduce work-in-process inventory. C) materials management system for removing all inventories. D) integrated system of managing resources, information, and decision processes to eliminate waste.
In most contracts, promises of performance are not expressly conditioned
a. True b. False Indicate whether the statement is true or false