Right; OP was asking why they would be supporting their currency if they were trying to devalue it. And honestly, the "stock market crash" was just a correctio

Right; OP was asking why they would be supporting their currency if they were trying to devalue it. And honestly, the "stock market crash" was just a correction. Yes, it declined by 50% over 2 months. But in the 9 months between September 2014 and June 2015 it had risen by over 250% - these most recent losses represent only about half of the total gains over the last year. China is a fast growing economy, and fast growing economies are volatile and prone to asset bubbles. Its economy is less reliant on its stock market than the US; hence the market can slide way, way further out of equilibrium than in the US because it's not as liquid and is only weakly tied to economic fundamentals.