Originally posted by Davo36
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China wants to keep its USD balance (aka FX reserves) at a certain level to maintain FX rate stability. The RMB / CNY is a managed exchange rate (managed by People's Bank of China aka PBOC (the Chinese Central Bank) to be within a certain exchange rate band), not free floating like USD, NZD, AUD, Euro, GBP. This supports the local currency RMB / CNY. If FX reserves get too low, then they don't have sufficient USD for every RMB 1.00 printed by the Central Bank of China in the monetary base, which leads to currency devaluation. Gold use to be the asset to support locally printed currencies (so that central banks don't print too much and people don't lose confidence in the local currency), but now central banks use the USD (hence the term reserve currency).
If you want an extreme case, look at Venezuela - insufficient FX reserves to import basic necessities, hyperinflation (as government prints local currency to pay its labour force such as military) and rapid currency depreciation.
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