​Monitoring

A) ​Gives the principle a better performance evaluation metric
B) Allows the principle to better align the incentives of the agent with the goals of the principle
C) Can be costly for the principal
D) ​All of the above

Marketers often create a special marketing mix for loyalty segments because these segments are

A) too large to service with ordinary targeting.
B) difficult to identify.
C) costly to acquire.
D) generally profitable.
E) constantly changing.