Hello, this may be related to the following factors:
1. Release date: The S7 was released a year before the S8, so the price of the S7 may have stabilized, while the S8 is still in the early stages of release.
2. Design and features: The S8's design and features are more advanced than the S7, which may bring higher manufacturing costs and therefore a higher price.
3. Economic factors: Market competition, supply and demand and other economic factors may also affect the price.