"If I was speaking with a customer who wanted your product but at a lower cost point, I would point out the ways it is better than the alternative options available. I would mention the stock trading app is innovative and, unlike the other options they could consider, it is based on a superior smart algorithm technology. The apps with a lower price point can't offer up-to-the-minute live updates from multiple stock exchanges, and that feature makes it easier for the user to carry out not only well-informed but also profitable trades. It also offers personalized investing ideas and is extremely secure. The extra 25 our app might cost you is more than made up for in the 100 plus you'll get in extra benefits. If you don't believe me, look at customer testimonials. Our users tell us and everyone else they talk to that they are making more profitable trades with our app than on any other app they have ever tried."

Consider mentioning product features, cost/benefits, and user testimonials during your answer. Show the interviewer that you did your homework and have a solid understanding of their product.