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HAS-A and tight coupling

 
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On page 164 of K & B, explanation for a Question is given as follows:


HAS-A relationships can lead to tight coupling, it is by no means always the case.



Can you explain how the relationship between HAS-A relationship and tight coupling.
 
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Tight coupling means difficult to refactor. Let us take a simple example of HAS-A relationship- A car HAS-A wheel. Now, suppose in future you want to refactor your code and want to move out the Wheel object out of the Car object, it will be bit difficult. That�s why HAS-A is tightly coupled.
 
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