Financial contagion and the crash: how a local shock goes global
The essentials in 30 seconds
- Financial contagion is the spread of market disturbances, mostly on the downside, from one country to another.
- Thailand devalued the baht on 2 July 1997, and the shock reached Indonesia, the Philippines, Malaysia, South Korea, and Hong Kong in under 2 months.
- Long-Term Capital Management lost 44% of its value in August 1998, a case Wikipedia ties to the 1997 Asian contagion.
- India’s Sensex fell from over 21,000 in January 2008 to below 8,000 in October 2008.
- As of October 2026, the four channels give a map of where a shock would travel.
A stock market crash often starts as a local event, and contagion is the reason it does not stay local. This page defines financial contagion, describes the four channels that carry it, and follows three dated cases: Thailand in 1997, Russia in 1998, and the global events of 2008. It is a detailed page under the guide on how one failure spreads.
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What does the term financial contagion describe?
Financial contagion is the spread of market disturbances, mostly on the downside, from one country to another. It shows up as co-movement in exchange rates, stock prices, sovereign spreads, and capital flows. The term also covers spread across institutions inside one country, such as when one bank’s failure hits similar banks (en.wikipedia.org/wiki/Financial_contagion).
The word separates two situations. If a shock hits several markets because they share the same cause, each market reacts to the same news. If a shock passes from one market to another through a link, the second market suffers from a problem it did not create. Contagion describes the second situation, and the links are the thing to map.
Through which channels does financial contagion spread?
Four channels recur. Trade links carry a currency fall in one country to its partners, whose exports and asset prices may suffer. Financial links carry losses through the balance sheets of banks, hedge funds, and other intermediaries. Competitive devaluation pushes other countries to defend their currencies when a rival’s devaluation erodes their export advantage.
The fourth channel is investor behaviour. Investors sell holdings across markets to raise cash, because of liquidity needs, differences in information, or a shift in beliefs about which outcome is likely. This channel explains why markets with weak links to the source can still fall, since sellers raise cash wherever they can sell.
How did the 1997 Thai baht shock spread across Asia?
On 2 July 1997 Thailand devalued its currency against the US dollar, after months of speculative pressure that had depleted its foreign exchange reserves. Malaysia, the Philippines, and Indonesia let their currencies weaken substantially, and Indonesia slid into a broader financial and political crisis. South Korea faced balance-of-payments pressure that brought it close to default (federalreservehistory.org/essays/asian-financial-crisis).
Thailand’s banking problems prompted foreign investors to pull back, which set off a cycle of currency depreciation, recession, and further banking weakness. Foreign creditors withdrew from other countries with similar vulnerabilities, and Japanese banks cut regional lending. Hong Kong faced several large speculative attacks on its peg, and the first triggered short-term stock sell-offs worldwide.
How did 1998 show financial contagion reaching Wall Street?
In 1998 the pressure passed to Latin American and Eastern European emerging markets, including Brazil and Russia, which faced balance-of-payments pressure (federalreservehistory.org/essays/asian-financial-crisis). Wikipedia cites the Russian default of 1998 as a trigger for explanations of contagion based on investor psychology and behaviour.
Long-Term Capital Management lost 44% of its value in August 1998, with about $30 of debt for every $1 of capital, and a group of 14 banks and brokerage firms put in $3.625 billion on 23 September 1998 (federalreservehistory.org/essays/ltcm-near-failure). Wikipedia ties the 1997 Asian episode to this collapse in the United States, a path that shows contagion in a complete form: a shock abroad, then a hedge fund, then its lenders.
How did the 2008 financial crisis become a global stock market crash?
The 2007-2008 crisis began with the US housing bubble and rising mortgage defaults. Bear Stearns required a government rescue by March 2008, and Lehman Brothers and AIG were also hit. Most US and European banks pulled back international lending, and countries as different as Germany, Iceland, Spain, Britain, and New Zealand were affected (en.wikipedia.org/wiki/Financial_contagion).
A stock market crash followed in many countries. India’s BSE Sensex fell from over 21,000 in January 2008 to below 8,000 in October 2008, and Indonesia halted trading after a 10% one-day drop on 8 October 2008. Many exchanges had their worst declines in history on 24 October 2008, with most indices down about 10% (en.wikipedia.org/wiki/Stock_market_crash_of_2008).
Why do stock markets fall together in a financial contagion?
In calm periods investors treat markets as separate, and prices follow local news. In a crisis they treat markets as one pool of risk. A fund that loses money in one place sells what it can sell elsewhere, so unrelated assets fall together. Diversification across countries then protects less than its design promises, at the moment you need it.
This is the practical meaning of contagion for a portfolio. The benefit of spreading holdings across markets depends on the links between them, and the links tighten under stress. A reader who knows the channels can ask which of their holdings share a funder, a currency, or a buyer.
Which readings show financial contagion risk before a crash?
Five readings give an early view. Currency pressure shows stress in a trade partner. Short-term foreign borrowing shows exposure to a pullback. The share of an economy’s exports going to a single market shows a trade dependency. Bank lending across borders shows financial links. The speed at which foreign investors reduce holdings shows behaviour.
As of October 2026, record the five readings each quarter for the markets you hold. A rise in several at once marks a region where a local shock would find a path. This page is general information, not investment advice, and it supports a decision rather than replacing one.
How can you test your own exposure to financial contagion?
Write down your holdings by country, currency, funder, and counterparty, then mark the links that connect them. The EQOS Asia Λ simulator estimates the structural score of your case in 10 minutes and shows which dimension a spreading shock would stress first.
For a decision in Singapore, ASEAN, or Hong Kong, the EQOS Asia contact page books a 30-minute conversation that applies the same scoring to your exposure. The EQOS Asia method page explains how the score is built, and you can recompute it. A map of your links gives you the choice of where to cut.
See also in this guide
Frequently asked questions
What is financial contagion?
Financial contagion is the spread of market disturbances, mostly on the downside, from one country to another. It shows up as co-movement in exchange rates, stock prices, sovereign spreads, and capital flows, and it can also pass between institutions inside one country.
What are the channels of financial contagion?
Four channels recur: trade links, financial links between balance sheets, competitive devaluation that pressures other currencies, and investor behaviour such as selling holdings across markets to raise cash. Each channel can be observed, so a regional investor can monitor it.
How did the Asian financial crisis spread in 1997?
Thailand devalued the baht on 2 July 1997. Foreign investors pulled back, and Malaysia, the Philippines, and Indonesia let their currencies weaken. South Korea came close to default, and Hong Kong faced attacks on its peg. Foreign creditors withdrew from other countries with similar vulnerabilities.
Does diversification protect against contagion?
Diversification protects less when links tighten under stress, because funds sell what they can sell and unrelated assets fall together. As of October 2026 the useful step is to check which holdings share a funder, a currency, or a buyer.
Test your knowledge
1. On what date did Thailand devalue the baht in 1997?
- 2 July 1997
- 15 September 2008
- 9 August 2007
Show the answer
2 July 1997.
2. Which fund lost 44% of its value in August 1998?
- Reserve Primary Fund
- Northern Rock
- Long-Term Capital Management
Show the answer
Long-Term Capital Management.
3. Which channel describes selling holdings across markets to raise cash?
- Trade links
- Investor behaviour
- Printing money
Show the answer
Investor behaviour.
4. How low did India’s Sensex fall in October 2008?
- Below 8,000
- Below 80,000
- Below 800
Show the answer
Below 8,000.
5. What tightens under stress and weakens diversification?
- Company names
- Office leases
- The links between markets
Show the answer
The links between markets.
About the author
Stéphane Jambu
President, EQOS Forecast Asia
Stéphane Jambu leads EQOS Forecast Asia and works as a consultant in e-commerce, search visibility, and AI. LinkedIn profile
Sources: EQOS Asia simulator (eqos-asia.com/simulator.html), contact page (eqos-asia.com/contact.html) and method page (eqos-asia.com/method.html), Federal Reserve History, Asian financial crisis (federalreservehistory.org/essays/asian-financial-crisis) and LTCM near failure (federalreservehistory.org/essays/ltcm-near-failure), Financial contagion (en.wikipedia.org/wiki/Financial_contagion), Stock market crash of 2008 (en.wikipedia.org/wiki/Stock_market_crash_of_2008), consulted on 22 October 2026. Page updated on 22 October 2026.