What it means
The typical sequence starts with a visible imbalance: a large current account deficit, heavy short-term foreign borrowing, or a fixed exchange rate that has become detached from economic reality. Investors begin to doubt the rate can hold, and the doubt itself accelerates the outcome.
Once selling starts, the central bank defends the rate by buying its own currency with foreign reserves. Every day of defence burns reserves, and traders can watch the reserve figures fall, so the defence advertises exactly how much time is left.
When the reserves run low the peg breaks and the currency falls sharply, often by 40% to 70% within months. This is not a gentle repricing: it is a step change that instantly rewrites every contract denominated in a foreign currency.
The most destructive channel is foreign-currency debt. Governments and companies that borrowed in dollars because the rate seemed stable find their repayments doubling or tripling in local terms while their revenues, earned locally, do not move at all.
Central banks usually respond by raising interest rates very high to make holding the currency attractive again, which chokes domestic borrowing and deepens the recession. The combination of import price inflation, a credit squeeze and bank failures is why currency crises typically become banking and debt crises too.
For a business, the practical defences are known well in advance. Avoid borrowing in a currency you do not earn, keep some reserves offshore, hold contracts that allow price adjustment, and treat a persistently overvalued official rate as a warning rather than a convenience.
In practice
Real-world examples.
Example
An agricultural exporter in a country entering a currency crisis finds its dollar revenue suddenly worth far more in local terms, turning a marginal business into a highly profitable one while its domestically focused neighbours struggle.
Example
A retailer importing 80% of its stock watches its landed cost double in four months. With customers unable to absorb the increase, it closes a third of its stores and shifts to locally produced goods at lower margins.
Example
A multinational with a subsidiary in the affected country writes down the translated value of that unit's net assets by half. Local operations are unchanged, but the group accounts show a substantial foreign exchange loss.
Think of it
“Currency crisis is a sudden collapse in currency value-a sharp, destabilizing fall.
Formula
Calculation
Depreciation % = (old foreign-currency value of one local unit - new value) / old value x 100
Local-currency cost of foreign debt = foreign-currency debt x local units per unit of foreign currency
A country's currency trades at 20 units to $1. Over four months of a crisis it falls to 50 units to $1.
Old value of one unit = 1 / 20 = $0.05. New value = 1 / 50 = $0.02.
Depreciation = ($0.05 - $0.02) / $0.05 = 0.60, or 60%
Now take a local manufacturer with $40,000,000 of dollar-denominated debt and annual revenue of 600,000,000 local units, all earned domestically.
Before the crisis, the debt was worth 40,000,000 x 20 = 800,000,000 units, or 800 / 600 = 1.33 times annual revenue.
After the collapse it is worth 40,000,000 x 50 = 2,000,000,000 units, or 2,000 / 600 = 3.33 times annual revenue.
The debt has risen by 1,200,000,000 units, a 150% increase, without the company borrowing another cent. Meanwhile the central bank spent $12,000,000,000 of an $18,000,000,000 reserve stock defending the rate, leaving only $6,000,000,000, a two-thirds reduction.Case study
Seen in the real world.
Solvara Foods is an invented processed-food company used purely as an illustrative example. Operating in a country with a currency pegged at 20 units to the dollar, it borrowed $25,000,000 in dollars to build a new plant, because dollar interest rates were 6% against 19% locally and the peg had held for nine years.
When the peg broke and the rate moved to 50 units, the loan's local-currency value jumped from 500,000,000 units to 1,250,000,000 units overnight. Roughly 85% of Solvara's revenue came from domestic supermarket sales in local currency, so there was no offsetting gain anywhere in the business.
In this fictional account the company survived, but only after selling its distribution fleet, restructuring the loan over eleven years and pivoting 30% of production to export markets so that some genuine dollar revenue existed to service the dollar debt. The illustrative lesson repeated by its finance director afterwards was blunt: the interest rate saving on foreign borrowing is the price the market charges for taking on the exchange rate risk.
Watch out
Common mistakes.
- Reading a long-stable peg as evidence that a currency is safe. Pegs tend to look strongest immediately before they break, because the pressure builds invisibly in the reserve figures.
- Borrowing in a foreign currency purely to obtain a lower interest rate. The rate gap generally reflects expected currency movement, so the saving is compensation for a risk, not a free lunch.
- Assuming a currency crisis is only a government problem. Import costs, foreign-currency loans, supplier terms and credit availability all change for private companies within weeks.
Questions
People also ask.
What normally triggers a currency crisis?
A combination of a large external deficit, heavy short-term foreign debt and dwindling reserves, usually set off by an event that makes investors doubt the exchange rate can hold.
Can a floating currency have a crisis?
Yes, though it looks different: there is no peg to break, so the pressure shows as a rapid slide and a spike in inflation rather than a single dramatic step.
How can a mid-sized business prepare?
By matching the currency of its debts to the currency of its revenues, holding some cash outside the country, and including exchange-rate adjustment clauses in longer supply contracts.
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