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I came across this list of countries with their forex reserves and what's interesting is that the developing nations (also some of fastest growing economies) like India, China, Brazil, Thailand are having even bigger forex reserves than their developed counterparts. What might be the possible reason behind having greater forex reserves in comparison to developed countries? Does it has anything to do with the geopolitics?

For example - China and India's combined forex reserves stand at 3.655 trillion dollars which is more greater forex reserve than that of US + UK + France + Germany + Canada + Australia + Italy + Switzerland + Poland + Denmark + ... ( A lot of other developed nations) combined together.

Note - Out of all of the developed nations, Switzerland and Japan are the only nation with Forex reserve exceeding 500 Billion dollars.

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Developing countries gather foreign exchange because the trust it more than their local currency. This causes trade deficits, as the developing countries trade goods to get the foreign exchange. If a developed country wants foreign exchange, it can swap its own currency for it. It doesn't need to sell goods for it. But developing countries have a greater demand for foreign exchange.

Developed countries may continue to do this because they build themselves around exporting in exchange for foreign exchange and don't know how to stop. This explains countries like Japan and China. They haven't transitioned from developing to developed yet, at least not at the macrofinancial level.

Switzerland has a long history as an international financial center. Hard to do that without foreign exchange reserves.

You also might consider that China and India have about a third of the world population. Per capita, India has less foreign exchange than the United States does. And China has less than Japan per capita.

Part of this of course is that it is easier for small countries to have relatively large amounts of trade and foreign exchange. The US does most of its exchange internally. It takes a deliberately mercantilist policy like Japan and China have traditionally had to generate large amounts of foreign exchange.

Mercantilism made a little sense in the days of gold-based currency. At least a collection of gold would have been a collection of gold. But even then it wouldn't have scaled. Once the amount of gold stored starts getting larger than the amount of trade, there are diminishing returns. Because spending that much stored currency at once would induce inflation. Inflation makes the stored currency worth less. So you have less than what you thought you stored.

With fiat currency, that's even worse. In addition, there is the possibility that to counteract that inflation, the country might stop respecting the currency that foreign countries hold as foreign exchange. E.g. if China were to hold Indian rupees but India switched to a different currency, then China would be left with nothing.

Developed countries are seen as less likely to do things like that. So countries are more willing to hold their currency. That makes it easier for them to trade, as they purchase imports with their own currency. Developing countries have to export to get foreign currency so that they can import.

All this gets us back to my first point. Developing countries trust foreign exchange more than their own currency. Developed countries generally have the reverse feelings. They trust their own currency more than foreign currencies. So developed countries have little foreign exchange and developing countries have a lot.

One of the key points though is that looking at foreign exchange surpluses and crediting them to trade surpluses is backwards. The trade surpluses exist because there is a desire for foreign exchange (generally US dollars). This is why devaluation doesn't work in the US. It's starting from the wrong end. It causes imports to increase in quantity because the unit price drops but they still want the currency. That of course is the opposite of the intended result.

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Foreign exchange reserve has nothing to do with a country's being developing or developed.

Foreign exchange reserve is needed to pay for the imported goods. The more you import, the more you need to maintain a good reserve of foreign exchange. Otherwise, your external debt will rise continuously.

If you compare the following tables from Wikipedia,

You will be able to realize that countries which import more while maintaining low external debt, maintain large foreign reserves.

For instance, USA is the largest importer of goods. But, its external debt is also humongous. So is the UK.

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Note: This question would likely get much better answers in the Economics SE.

The main reason is trade balance: more exports out than imports in means net foreign currency in, resulting in the central bank having lots of foreign cash to dispose of.

Another reason is to have a float in case your currency needs to be defended during a financial crisis - i.e. to avoid a repeat of e.g. the 1997 Asian financial crisis.

Or vice versa, in the case of Switzerland: because its currency is usually considered safe, its central bank desperately sought to sell its currency in order to keep it at a reasonable level while foreign money flowed in during the 2007-2009 crisis and its aftermath.

Japan is special too: it's usually considered safe (except by some bears owning to its huge public debt and/or its aging population) on top of historically having had a positive trade balance. (It went very negative this year ... so far.)

As an aside, raw foreign reserves doesn't give the whole picture. Another data point to have in mind are sovereign wealth funds, since these reserves get invested in some countries. In particular in oil exporting countries. Norway, for instance, has a fund worth around $1 trillion in assets.

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