When James Sinegal, the founder of Costco, discussed his experience with his mentor, he advised, "If you have the opportunity to get a mentor, take advantage of it. All of us know somebody who we respect in our lives, and that learning experience is invaluable." Mentorship is a large part of the culture of career growth at Costco. It also showcases what you stand to learn from such experiences and how it fosters the growth of your character. How you answer this question will offer your interviewer insights into the type of leadership that inspires you most and the kind of leader you could potentially be.