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4 October 2011 Last updated at 01:53 GMT
Many argue that the Chinese yuan is undervalued, giving China a massive trade advantage The US Senate has voted in favour of debating laws which could pressure China to let its currency rise in value.The bill would give the US government the power to add tariffs to goods imported from countries deemed to be undervaluing their currencies to boost exports.
Some politicians and trade groups say China uses its currency in such a way.
The Chinese government said that it "firmly opposed" the bill.
It accused the US of using the "so-called currency imbalance as an excuse to upgrade the exchange rate further, to take protectionist measures, [which is] a serious breach of World Trade Organisation rules, [and] seriously interfere with economic and trade relations".
Though the bill does not specifically mention China, it would enable the US government to put punitive duties on a country with a misaligned currency.
'Unfair competitive advantage'Unlike most other major currencies, China does not allow its currency, the yuan, to float freely on exchange markets. Academics have argued it could be undervalued by as much as 20% - 40% compared to the US dollar.
Continue reading the main storyUsing anti-dumping and countervailing duties to address currency valuation is misguided and could lead to a trade war”End Quote Stephanie Lester Retail Industry Leaders Association China has been accused of keeping the value of its currency artificially low in a bid to make its exports cheaper and more competitive than rivals. At the same time, it also makes goods from abroad more expensive for the Chinese buyers than products manufactured at home.
Many US politicians have said that China's currency policies have not only hurt US businesses but have also had an impact in the job market.
"My colleagues, both Democrats and Republicans, agree that China's deliberate actions to devalue its currency give its goods an unfair competitive advantage in the marketplace," Senate majority leader Harry Reid said.
"In the last decade alone, we have lost 2 million American jobs to China because of a trade deficit fuelled by currency manipulation," he added.
The debate on the value of the yuan and its effect on the US economy has been fanned further by a slowdown in the US and fears that it may be slipping into a recession.
At the same time, a high rate of unemployment has also become a huge problem for the authorities as they try to kick start growth in the world's biggest economy.
Unilateral approach? Continue reading the main story Use the dropdown for easy-to-understand explanations of key financial terms:AAA-rating GO The best credit rating that can be given to a borrower's debts, indicating that the risk of borrowing defaulting is miniscule.The US and China's other trading partners have been putting pressure on China to let its currency appreciate. While Beijing has allowed its currency to rise in the past 12 months, its critics have said that the appreciation has been too little.The yuan has gained almost 5% against the US dollar during the period and over 8% against the euro.
However, China has maintained that a sudden rise in the yuan's value would not only hurt its export sector but also have a detrimental effect on its overall economy.
Critics of the currency bill warned that any such law may negate efforts for a cordial agreement with China.
The Emergency Committee for American Trade said the bill was "a highly damaging unilateral approach that will undermine broader efforts to address China's currency undervaluation".
Others have argued that the US has created its own economic problems and that antagonising the Chinese could potentially provoke a trade war which would be even worse for the economy.
"Using anti-dumping and countervailing duties to address currency valuation is misguided and could lead to a trade war," said Stephanie Lester of The Retail Industry Leaders Association.
"Sparking a trade war with China - one of our largest and fastest growing export markets - could have disastrous consequences for American companies and workers, and for our economic recovery," she added.
President Obama has said that any action by the US has to be consistent with international treaties The US senate has postponed its vote on the much-debated currency bill until next week amid differences between the Republicans and Democrats.