It’s a very keen observation and description by Kenneth Rogoff in his book Our Dollar, Your Problem that China prioritizes a USD exchange-rate objective over domestic inflation targeting.
What are the implications?
1/ Tighter capital movement control
The “impossible trinity” says a country cannot simultaneously have a fixed (or tightly managed) exchange rate, free capital movement, and independent monetary policy.
Since China uses the peg and China wants more independent monetary policy (when Fed raised interest rate last cycle in 2022, China didn’t follow), it has to have tighter capital movement control.
Or PBOC policy shall move more in-line with US Fed policy.
2/ Real exchange rate moves
With a mostly fixed nominal RMB/USD, the real exchange rate moves via the inflation gap:
If China inflation below the US, China gets a real depreciation (more competitive) even without nominal RMB weakening. This is what happened in the last few years, and foreigners will find traveling in China very cheap (e.g. Chinese hotel price).
If China inflation above the US, China gets a real appreciation (less competitive) even if the nominal stays “stable.”
3/ Intervention can force money/credit swings
Defending the exchange-rate path often requires buying/selling FX:
When inflows are strong, the central bank buys USD and creates RMB liquidity (which can be inflationary/credit-boosting).
When outflows dominate, defending the rate can drain RMB liquidity (which can be contractionary).
4/ It tends to bias the economy toward tradables and away from household consumption
If the RMB is held weaker than it otherwise would be (or just “less strong” than productivity would imply), it functions like:
a subsidy to exporters/tradable producers, and
a tax on importers/consumers (imports cost more in RMB terms than under a stronger currency).
5/ Bigger reserves and bigger balance-sheet exposure to USD assets
Exchange-rate management usually accumulates FX reserves (especially in surplus periods). That brings valuation risk when USD moves, opportunity cost (low-yield reserve assets vs domestic needs), geopolitical/financial exposure to the dollar system.


