My thought is that platform has become a rule of the whole world. It is a major driving force behind the global economy now. For example, typically, there are a lot of platforms including Facebook, Twitter, Google, Apple as well as domestic companies, such as Naver, Kakao. They're grasping wealth and, at the same time, taking control of the world economy now. Domestically, in the past, large firms played a role of current platform. However, nowadays, it is being replaced by Naver and Kakao. This means that the world id changing drastically. But the platform economy has a lot of problems: ever-worsening polarization and monopoly. But some people say this: on the other hand, the platform economy is making our life more convenient. In fact, it is creating jobs. This has some advantages and disadvantages simultaneously. I want to tell you that platforms are irresistible! It is the stream of the times! Accordingly, so as to get money, we should learn about the platform economy. Eventually, I think that the platform economy will be more likely to lead the 4th Industrial Revolution and be at the apex of the future technology!