Final answer:
When a marketing plan is executed ineffectively, it is almost always the result of poor planning.
Step-by-step explanation:
When a marketing plan is executed ineffectively, it is almost always the result of poor planning. Poor planning can lead to a lack of clear goals, a misunderstanding of the target audience, and a failure to allocate resources effectively. Without a well-thought-out plan, a marketing campaign is likely to be disorganized and ineffective.