http://www.washingtonpost.com/wp-dyn/content/article/2010/03/25/AR2010032503772.html
Much pressure has been put on Treasury Secretary Tim Geithner to officially declare China a "currency manipulator," which makes it sound like we have a lot more authority than we really do to change China, let's face it...we need them. Make no mistake that they need us too since we are one of the vital tools allowing them to remain "currency manipulators," namely our abundance of purchasable debt (Treasuries) that China has been hoarding like spare pennies. It is incredible how the media and society have been able to convince people that you need a fancy degree to understand currency manipulation- it need NOT be confusing!!
Basically, we can think of each currency as a good in a market. When there is a lot of a good around, the price of that good is comparatively lower (or the currency is worth less). This is because it is common and therefore not as desirable, in economics we call this excess supply of goods. On the flip side, when there is too little of a good (like gold!) it is worth comparatively more (currency is more valuable) since it is more desirable. Predictably, we call this excess demand of goods. This is ALL the theory background you really need to understand what China is doing- here is how it goes:
1. China seeks to have a semi-fixed exchange rate against the U.S. dollar (more like a ballpark rate). This is now about 6.something Chinese Yuan to the U.S. dollar.
2. It is hard to keep this exchange rate fixed- why? Well, China has cheap exports, so a lot of people want to buy them. To buy them you need to convert your currency to Yuan, so demand for Yuan goes up. From our above theory, we know this SHOULD make the price of Yuan (or its value) increase (this is when the manipulation comes into play!).
3. China doesn't want its exports to get more expensive (they like people buying crap from them- go figure) so they buy every foreign asset (like our Treasuries) they can find. What does this do?? WELL- they are able to FLOOD our banks with their currency and therefore increase the supply of yuan in our market. This increase in supply will lower the demand, and therefore, the value of the Yuan back to the set rate that China likes.
I think we need not worry because this process is EXHAUSTING and China cannot keep it up forever. With the U.S. recession, our asset yields have gone way down (Yeah America!) and China is now losing massive amounts of money by buying them- so it may also be no longer worth it to do this manipulation. Many Economists have guessed that they Yuan is anywhere between 20-30% undervalued, but the good news is that it has appreciated slightly in the recent months. If the Yuan-dollar exchange rate is allowed to float China might also gain the advantage of more controlled monetary policy since they will be able to pursue an inflation rate instead of having to worry about keeping their fixed exchange rate.
Scared? Don't be. While China's undervalued currency does take a toll on our export markets (since their goods are comparatively cheaper), there is no way that we can blame our lost jobs and devastating unemployment rate on them. Sorry guys! Hopefully our financial recovery will kickstart productive sectors of our economy, or some sort of structural reform will take us out of the woods!