Congress in last couple of years has stressed more and more to pressure China to ease restrictions on its currency. In my post about
currency exchange, I explained how the value of currency affects exports and imports of a country. Based on that discussion, we know that when a currency is devalued, its exports increase. So when China undervalues its currency, it helps keeps Chinese products cheap and helps its exports.
In my post about currency exchange I explained how foreign exchange market determines the price of a currency. So how is it that the price of Chinese Yuan is not determined by the foreign exchange market. The answer is because Chinese government through People's bank of China controls how much Yuan is going to flow into the market, effectively controlling the price of Yuan.
Let's see this through an example. Assume there is a factory in China that supplies some product X which is sold to the US. Now the US buyer will make its payments in USD to this factory for the product X. But this factory needs Yuan to pay its employees, to buy raw material (if its not imported), pay for factory bills, taxes and other similar expenses. So the factory will go to People's bank of China and exchange its USD for Yuan. This is where Chinese government control comes in and it decides the price of Yuan. This USD, and similar hundreds of millions (billions per year) end up in Chinese reserves and significant portion of this USD is used to buys US government bonds, making Chinese government the biggest, US lender.
Now that we know how Chinese government controls the price of Yuan, how does it affect (hurt/benefits) US. First of all, for no change in income of American consumer they can buy more Chinese goods because they are getting more Yuan than they would in a freely traded Yuan in a foreign exchange market. So American consumer is better off. Then why does Congress and White house has an issue? Because Congress or White house are not there to help american people. They are there to help those who fund their campaigns. While American people are better off when Chinese government undervalues its Yuan, the American business which is competing against a Chinese business is worse off. So these businesses combine together lobby the government and push for pressure on Chinese government to reevaluate its currency against dollar. This will hurt American consumer because Chinese goods will increase in price but will help American businesses as it would be easier for them to compete now.
This in a nut shell is how Chinese government undervalues its currency and how it affects its trading partners, the biggest of which is US. If you ask me, I'd say let them undervalue their currency as it helps me get cheap products from China.