BitMEX's picture shows early October,
There are a large number of traders,
Think that the global economy will start to collapse,
So from the middle of October, BitMEX the way down.

And when the economy collapses
False Cryptographic currency will be worthless
So Cryptographic currency will definitely go down first.

BitMEX expression the people's Thoughts.
that is, the climb or decline of the BitMEX chart - expression the confidence of the people in the global economy.
BitMEX has climbed sharply - Most people think the global economy will take off.
BitMEX fell sharply - representing the majority of the public that the global economy will collapse.

Because the trade of BitMEX is buying/selling
You can buy - if Cryptographic currency up - you make money
Can also sell - if Cryptographic currency down - you make money

BitMEX can Borrowing 100 multiple,
As long as the electronic currency rises and falls 1%, you earn 1 share or lose your 1 share.

And the reason why Cryptographic currency fell,
The real reason is the foreign policy of A-country , And C-country's news coverage,
Let most C-country people feel that the global economy will be under the blow of A-country.
A-country will Climbing , other countries will fall,
So the global economy will collapse and Cryptographic currency prices will go to down.