You think too much. The premise of shorting is that foreign investors have so many stocks that they can sell the index and then make a profit in stock index futures or a50 short orders.

Let's take a look at the satisfaction of these two conditions.

Foreign capital accounted for less than 4% of A shares, which caused A shares to fall by 4%. How to short?

So far, the state has limited the number of lots of stock index futures. What do foreign investors make money by shorting?

A50 is almost a futures linked to the change of SSE 50. It is not a50 that affects SSE, but SSE that affects a50. You understand the wrong direction. The reason why a50 leads A-shares most of the time is that large funds holding a certain proportion of A-shares are laid out in advance.