That is because USD is reserve currency. In coming 2 decades you will see RMB and Ruble dominates. Already in many parts of Asia RMB is used like USD way more than USD like 5 ywars ago. Once BRICs and digital yuan kicks into high gear in 3 years, tsunami of recessions and inflations hitting USA shores like crazy. Many of my friends there now shifted out of USD and park their money in regional currencies like Yuan, Yen, SG, and even Ruble. Some opt heavily in gold and park it in Singapore.