Final answer:
Control plans can vary in effectiveness; a plan addressing multiple goals isn't always efficient, as context matters, demonstrated by the inefficiency of command-and-control in environmental regulation compared to flexible market-oriented tools.
Step-by-step explanation:
In general, control plans may vary in their effectiveness and efficiency based on how they address control goals. While a control plan that addresses multiple goals may appear to be more efficient, this is not always the case. A robust control plan needs to be designed considering the specific context in which it operates. For example, in the context of environmental regulation, a command-and-control approach, which mandates the same requirements for all producers, may not be efficient due to the varying technologies and costs faced by different firms. Conversely, market-oriented tools might offer a more flexible and potentially efficient alternative. This illustrates that the efficiency and effectiveness of a control plan can be contingent on whether it can adapt to address multiple goals in an integrative manner.