What it means
Think of reserves as a country's emergency fund. A central bank holds them so that it can pay for imports, repay foreign debt and, if necessary, step into the currency market to calm sharp moves in the exchange rate.
Most reserves are held in major, easily traded currencies and in highly rated government securities, because the assets must be safe and sellable on short notice. Many central banks also hold gold, and some hold claims on the International Monetary Fund known as special drawing rights.
How much is enough is a matter of debate. Analysts compare reserves with monthly imports, short-term foreign debt and the size of the money supply, and they often look at several measures together instead of relying on one.
Reserves influence exchange rates and borrowing costs. A country with strong reserves is seen as better able to defend its currency and meet its obligations, so its borrowing costs tend to be lower, while a country with thin reserves is more exposed to sudden capital outflows.
Holding reserves also has a cost. The money could otherwise be invested domestically, and reserve assets usually earn modest returns, which is why central banks try to balance safety against opportunity cost.
For business leaders, reserve levels are a signal about the stability of the countries they trade with. Falling reserves may be a warning of currency pressure, import restrictions or delays in converting local currency into dollars.
In practice
Real-world examples.
Example
A central bank sells part of its dollar reserves to buy its own currency during a sharp sell-off. The purchases slow the currency's decline and give businesses time to adjust their prices. Importers also gain a little breathing room before their costs jump.
Example
An exporter negotiating payment terms with a buyer in a smaller economy checks the buyer country's reserves. After seeing import cover of less than two months, it asks for a letter of credit. The bank guarantee gives the exporter confidence that payment will arrive even if the buyer's country runs short of dollars.
Example
A ratings analyst reviewing a government's creditworthiness compares reserves with short-term external debt. She concludes that reserves are adequate to meet payments due in the next year. Her report notes that the position would look weaker if export earnings fell sharply.
Formula
Calculation
Import cover (months) = Reserves / Average monthly imports
A country holds reserves of $24 billion and imports an average of $4 billion of goods and services each month. Import cover is $24 billion / $4 billion = 6 months, meaning the reserves could pay for six months of imports if no foreign currency came in at all. If reserves fall to $12 billion and imports stay the same, cover drops to $12 billion / $4 billion = 3 months. Many analysts view cover of roughly three months as a minimum comfort level, though this is a rule of thumb and not a law. A country with large short-term foreign debt may need much more cover than the import measure suggests.Case study
Seen in the real world.
The Republic of Lorvania is an illustrative, fictional emerging economy that earns most of its income from exporting a single commodity. When the commodity price fell 40%, export income dropped, and investors began to withdraw money from local bonds.
Lorvania's central bank held reserves equal to eight months of imports. It used part of them to support the currency and repay maturing foreign debt, while reserves fell to five months of imports.
Because the cushion was large enough, the fictional government avoided a currency collapse and had time to adjust its budget. A neighbouring country with only one month of cover, in the same story, was forced to impose import controls within weeks. Companies there struggled to pay overseas suppliers for months.
Watch out
Common mistakes.
- Treating reserves as if they could be spent freely on the budget, when they are held to support the currency and external payments and to reassure lenders.
- Looking at the headline reserve number without comparing it to imports, short-term debt or the size of the economy.
- Assuming all reserve assets can be sold instantly, when some may be tied up or hard to sell in a crisis.
Questions
People also ask.
What is in a country's monetary reserves?
Typically foreign currencies, gold, special drawing rights and the reserve position at the International Monetary Fund. The mix depends on the central bank's policy.
How much reserve is enough?
There is no single answer, but analysts compare reserves with import needs, short-term foreign debt and the exchange rate regime. Three months of imports is a common rule of thumb, but the right level depends on how volatile capital flows are.
Do reserves belong to the government?
They are usually held and managed by the central bank on behalf of the state. The legal arrangements differ by country, and in some places part of the reserves is managed by the finance ministry.
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