Dominique Strauss-Kahn the IMF’s Managing Director said co-operation between countries had weakened since the financial crisis started in 2008.
The Fed’s policies have led to a wave of money-seeking opportunities in the emerging economies. That tends to push their currencies up, undermining their competitiveness.
There is also the risk of bubbles in financial and property markets. And capital inflows can go into reverse – as they did in the Asian crisis in the 1990s.
So the third element in the currency “war” is the resistance of emerging economies, and some developed ones too.
Brazil and Thailand have used tax measures to slow the inflows. Japan, South Korea and others have intervened in the currency markets, buying foreign currency in an attempt to interrupt the rise of their own.
There is a view that they will just have to live with it. The upward pressure on the currencies of many emerging economies reflects the fact they are more growing strongly than the US.
It is difficult for them to manage, but the underlying reason is that they are doing relatively well.
The currency war is closely linked with another theme that has been troubling many economists for several years, that of global economic imbalances.
In international terms, it is trade that is unbalanced. Actually, the thing that is most often the focus is the “current account balance”, which means trade in goods and services plus some financial items, including remittances that migrant workers send home.
Usually, though, trade is responsible for most of the current account imbalance.
Some countries have large trade surpluses, notably China, Germany, Saudi Arabia and Russia. The biggest deficit country is the United States.
Some countries at the eye of the European storm have hefty deficits too – the PIGS aka Portugal, Ireland, Greece and Spain.
Britain also has a deficit, although as a share of national income, it is not all that large.
The other side of international imbalances is high savings at home with a surplus country such as China, and relatively low savings in a deficit country such as the US.
Household savings have risen in the US, the UK and other deficit countries, because consumers are borrowing less in the wake of the financial crisis.
But international imbalances also reflect how much governments borrow and in many deficit countries that has risen, partly offsetting the increase in private savings.
Why does all this matter? Those countries where saving has risen desperately want to export more. They want to sell more abroad to make up for consumers at home drawing cutting back their consumption.
That is true of the US, Britain and many others. They could do that more easily if consumers in China and the other surplus countries were willing to buy more imported goods.
A rise in China’s currency would not be a cure all, but it would probably help in the short term. Although it would also create greater inflation.
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