W7L5，6

一 1原料费2工作人员费3广告费4设计策划费

1超值拼团

2节日特价

3第二件半价

4促销优惠

5领优惠劵

6好友砍价

7分享降价

二 In ordinary usage, price is the quantity of payment or compensation given by one party to another in return for goods or services.

https://en.wikipedia.org/wiki/Price

QQ音乐

W7L5，6

二A business model describes the rationale of how an organization creates, delivers, and captures value,[1] in economic, social, cultural or other contexts. The process of business model construction is part of business strategy.

https://en.wikipedia.org/wiki/Business_model