Is China's currency fix now a cap on daily appreciation?
Core argument: The onshore yuan has almost never traded stronger than China's daily Central Parity Rate in recent years, suggesting the fix now functions as the upper limit on daily appreciation rather than the midpoint of the trading band.
The daily Central Parity Rate (“fix”) is supposed to be the middle point in the daily trading band for China’s currency. But over the last few years, the onshore yuan almost never trades “strong” (numerically, a smaller number; the yuan is stronger if it takes six yuan to buy a dollar than if it takes seven or more) relative to the fix. It looks like—de facto—China has shrunk the band and shifted the role of the fix from the midpoint of the band to the upper end of the band. That of course allows China a lot more control over its currency on a day-to-day basis. The fix defines the upper limit on the day’s appreciation, more or less. [On the other hand], when the yuan is under depreciation pressure, the fix, minus two percent, still sets the limit on how much the yuan can depreciate.

