Your question is Handling Challenged Assumptions. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
You are walking an interviewer through your analysis and recommendation for a research project. Partway through, the interviewer pushes back on one of your assumptions and suggests it may not hold under a different market condition.
How do you respond when an interviewer challenges your assumptions?