Answer:
commodity money
Step-by-step explanation:
Fiat money refers to currency that has intrinsic value because a government backs it up, e.g. the US dollar is backed by the US government. In this case, the Chinese government was not able to back its own currency.
Commodity money refers to currency that gets its value form the materials that make it, e.g. Chinese currency was worth its weight on paper, since it was sold as paper. Other types of commodity money were cigarettes in prisons or gold coins.