The big idea: Economic interdependence is the money and trade side of interdependence — economies tied together by trade, investment and finance, so that one country's economy affects the others.
It is the deepest and most visible form of interdependence. The phone in your hand, the food in the shops and the price of fuel all depend on a web of countries buying, selling, lending and investing across borders.
- Trade — countries buy and sell goods and services across borders.
- Supply chains — one product is made from parts sourced in many countries.
- Investment — money flows across borders to build factories and buy shares.
- Finance — banks and markets are linked, so money (and losses) move fast.
Why it runs deepest: Economic ties are hard to cut without hurting yourself. If two economies each supply what the other needs, neither can walk away cheaply — which is why economic interdependence both binds states together and makes them vulnerable to each other.
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Economic interdependence means a crisis in one economy can become a crisis for all of them. The clearest example is the 2008 global financial crisis.
Case study — the 2008 global financial crisis: A crisis that began in the US housing market in 2007–2008 spread worldwide because banks and markets everywhere were financially linked. When big US banks failed, credit froze across the globe, trade collapsed, and countries far from the US — from Europe to Asia — were tipped into recession. No economy was an island.
The crisis showed both sides. The risk: linked finance spread the damage worldwide in months. The response: states had to cooperate (through the G20 and central banks) to stop a global collapse — showing economic interdependence also forces countries to work together.
The key point: Economic interdependence brings prosperity (trade and investment make countries richer) but also contagion (one economy's crash spreads). The 2008 crisis is the textbook case: a national problem became a global one because economies are financially tied together.
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Is economic interdependence a force for good? Weigh the prosperity and peace it may bring against the vulnerability and exploitation it can cause.
Link it up: Economic interdependence links to power (controlling a key export is leverage), sovereignty (it limits economic freedom) and the liberal theory that trade makes war less likely — a great point to bring into an essay.
How economic interdependence comes up in Paper 1: A Paper 1 source might show trade or finance linking economies. Remember the double edge: economic ties bring prosperity but also contagion when one economy falls.
With reference to a source and one example you have studied, explain how economic interdependence can spread a crisis.
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Easy marks to lose: 1. Only describing trade. Show it is two-way reliance, not just 'countries trade'.
2. One-sided answer. Give both prosperity and vulnerability.
3. No real example. Use the 2008 financial crisis or a supply-chain shock.
4. Confusing it with the other forms. Economic = trade, investment, finance.