Global Economics Beginner's Guide
Trade, capital flows, currencies, and growth — the foundations of how the global economy works.
Trade
Comparative advantage
David Ricardo (1817): countries gain from trade even if one is more productive in every good. Specialize in what you produce relatively better.
Key Points
- The classic example: Portugal and England producing wine and cloth.
- Modern version: Bangladesh in garments, Korea in electronics, Chile in copper.
- Doesn't predict which countries will grow rich — that's development economics.
Balance of trade & payments
Current account
Trade balance + net investment income + transfers. US has run a current account deficit most years since 1976.
Capital account
Cross-border financial flows. Must offset the current account by accounting identity.
Reserves
Central bank holdings of foreign currency. China holds $3.2T (2024), Japan $1.2T.
Money & Currency
Exchange rates
How much one currency costs in another. Three regime types.
Floating
Market-determined. USD, EUR, GBP, JPY.
Fixed / pegged
Central bank defends a set rate. HKD pegs to USD; many Gulf currencies peg to USD.
Managed float
Mostly market but with intervention. CNY, INR, BRL.
Reserve currencies
Key Points
- USD: ~58% of global reserves (2024). Down from 72% in 2000.
- EUR: ~20%.
- JPY, GBP, CNY, CHF: smaller shares.
- Reserve status gives issuer 'exorbitant privilege' (Valéry Giscard d'Estaing): cheap borrowing, sanctions leverage.
Central banks
Set monetary policy for their currency area. Primary tools: interest rates, reserve requirements, quantitative easing.
Key Points
- Federal Reserve (US), European Central Bank, Bank of England, Bank of Japan, People's Bank of China.
- Independence matters: politicized central banks tend to produce inflation (Turkey, Argentina as recent examples).
- The 'Fed put': markets expect the Fed to cut rates in downturns. Debated whether this is healthy or distortionary.
Growth & Development
What drives growth?
Key Points
- Capital: investment in physical and human capital.
- Labor: workforce size and skills.
- TFP (total factor productivity): how efficiently inputs are combined — institutions, technology, management.
- Solow growth model: long-run growth requires productivity gains, not just capital accumulation.
Institutions matter
Acemoglu, Johnson, Robinson (2001 AER, 2012 'Why Nations Fail', 2024 Nobel) argue inclusive institutions — rule of law, property rights, political voice — drive long-run prosperity.
Key Points
- Korea's divergence after 1953 is the cleanest natural experiment.
- Resource curse: countries with extractive institutions + natural resource wealth often underperform.
- Debates over path-dependence vs convergence continue.
Development economics today
Key Points
- J-PAL (Banerjee-Duflo-Kremer, 2019 Nobel) pushed randomized evaluations.
- Poverty-reduction focus: the 'bottom billion' (Collier 2007).
- Industrial policy resurgence: Korea-Taiwan models are being re-studied amid geopolitical competition.
FAQ
What causes inflation?
Aggregate demand > aggregate supply. Excess money growth matters over the long run (Friedman) but near-term inflation also responds to supply shocks (oil, shipping, chips in 2021-22).
Is the world deglobalizing?
Trade in goods plateaued post-2008. Services trade grew. 'Slowbalization' (The Economist 2019) captures the pattern. Ukraine war and US-China tensions have accelerated reshoring + friend-shoring.
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