Before the arrival of the euro in 2002, the international arena remained virtually unchanged for more than 30 years, although the volume of transactions in foreign currency increased dramatically.

Electronic trading has made it possible to initiate instant transactions worth billions of dollars.

This gave rise to the fragile nature of technologies with a lack of redundancy, but also not without consequences that have not been seen until now. China's emergence as a world power has focused people's attention on its economy and its currency, the yuan.