Hey everyone, I’m Lee215, an ordinary hobbyist of algorithm. I hope to bring pleasure and surprise to you through my code and I would like to thank Windson for this interview. Welcome all of you to follow my YouTube and Bilibili or know more on my Wechat Official Account “Lee215的Code”. I will update occasionally.

Six months ago, Overseas Rabbit Course started using a new pricing model. After applying the new strategy, revenue from each customer has increased by 2000%. According to this data, the new pricing strategy gained great success. Of course, it would be risky by inferring causation of success from numbers. But after such a large increase in revenue, this article will analyze the reasons behind it.