NO.PZ2022090802000003
问题如下：
Which is the most accurate statement about a platform business?
(备注：原版书课后题原题。和真题的出题形式不同（真题只有三个选项）。大家做题时不用纠结题目形式，关注知识点原理即可)
选项：
A.A platform business is based on network effects; A platform business can be a non-technology business. B.Value creation for customers for a platform business occurs externally. C.It can be difficult to attract users in the beginning to a platform business. D.All of the above解释：
Solution
D is correct. All these statements are true, in most cases, for a platform business. A platform business is defined as a business based on network effects—that is, where the value of its service or product is enhanced by the addition of customers or users. While many think of platform businesses as being web-based or software-based, there are many older business models that qualify, such as brokerage and exchange businesses and transportation and communication networks. The value creation for a platform business is external to the company that created the product or service. When the business is launched, it has no customers, which can make the launch challenging—one reason why many platform startups employ a "freemium" pricing strategy to attract users quickly.
为什么说platform business的value is created in the network outside the firm 呢
