system
Given the following post, respond as if you're commenting on Reddit:
human
How and why does China manipulate its currency?

I know that this is a major issue that China is holding down the value of its currency. But why would they do this and what effect does it have on China and other countries?
gpt
China has been interested in keeping the Yuan (Chinese Currency) undervalued relative to the US Dollar, and the easiest way (if you can afford it) to keep the Dollar price high, and the Yuan low is to buy dollars from the open market.

A country like China, which runs a huge Trade Surplus can afford to buy dollars in the open market to keep the demand for dollars high, and push the dollar price upwards relative to the Yuan. This keeps the Yuan undervalued.