Why do some products sell for 10$ ? The official minimum sell price is 30$.

[Yu Zhang]

Why do some products sell for 10$ ?  The official minimum sell price is 30$. 

[Yu Zhang]

Yes,I konw. The products sell for 10$ are earlier.

[Sergey Golubev]

Yu Zhang:
Yes,I konw. The products sell for 10$ are earlier.

Yes, that's right: they started to sell before this 30 dollar minimum was established.