Do you want to own your own plumbing business in the future?

It is okay to answer this question with a yes, or a no - but you should remain honest to what your long term goals really are. If the answer is no, you could say "So far, in my career, I have not had a desire to own my own plumbing business. It really hasn't been on my radar." OR, if the answer is yes, you could say "I have thought about owning my own plumbing business in the future but would like to gain more knowledge in plumbing and business operations."