Think of the principle concepts involved.
The medium of exchange, we can use gold, silver, or US Dollars for example.
But with US Dollars, going through the US banking system, those transactions can be sanctioned.
Therefore, if we do not want our transactions potential sanctioned, do not use US Dollars.
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That sentence that we find interesting, my opinion is that it is false. It is just sugarcoating it, that there is no effect, as of today I would believe.
Consider this. Suppose Iran telecom companies buys some Huawei equipment. Huawei would have some sort of office in Iran. The telecom company pays Huawei office in Iran with Iranian rial, suppose it is a check. Now that money is in Huawei Iranian bank account in rial.
Next, they should just exchange rial into RMB. Then the RMB leaves the country, via the DCEP or WeChat. No US Dollars are involved in this transaction.
DCEP and WeChat already operational, just the DCEP working out the details.
Mass adaptation has not happened for DCEP yet, but look how fast China went cashless as a society.
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Longer term, this is where the complicated parts are as they are rooted in history and the current system, the role of the US Dollar will change.
What does that mean, that is hard to say.
For example, the trade deal RCEP, in the long run they probably will not use dollars in that block. The EU, most of their trade is not in dollars inside the Euro block, it would be in Euros.
The Americans do not want to talk about this.