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The source attached to these statements doesn't seem to talk about these things at all, and instead talks about the 18th century. I've also found evidence that salt certificates were used to pay merchants in the 900s, but not in the 700s. If anyone could help clarify this, it would be helpful.
> In the year 758 the government official Liu Yan had convinced the imperial government to actively enforce its salt monopoly again. This was known as the Zhece policy. Under the Zhece policy Chinese merchants were paid in salt certificates in exchange for supplying the frontier armies directly as opposed to transporting government provisions to them. Fresheneesz (talk) 20:19, 21 August 2022 (UTC)