Chandra
Economist / Global / Capital Flows & Currency Crises

Capital Flows & Currency Crises

What Is Hot Money?

When the Fed prints money (QE), those dollars flow to emerging markets chasing higher returns. US Treasuries pay ~4–5%, EM bonds pay ~8%+. This is called hot money — portfolio investments (stocks, bonds) that can leave overnight.

The Boom-Bust Cycle

Phase 1: Hot Money Floods In

  1. Fed prints dollars, buys bonds → cash in the banking system
  2. Investors look for yield → sell dollars, buy EM currencies
  3. EM currencies strengthen (more demand for rupiah, real, lira)
  4. EM governments borrow cheaply in dollars
  5. EM companies borrow in dollars (lower interest rate than local)
  6. Stock markets boom, real estate booms, everything looks great

Phase 2: Fed Tightens → Hot Money Flees

  1. Fed raises rates → US bonds now pay 5% with zero risk
  2. Investors sell EM assets → buy dollars
  3. EM currencies crash (20-40% in weeks)
  4. EM central banks must raise rates to crazy levels to stop the bleeding
  5. Companies that borrowed in dollars can’t repay — local revenue is worth less in dollar terms
  6. Recession + defaults

Why Currencies React

To invest in Indonesia, an American must: (1) sell dollars, (2) buy rupiah. That’s demand for rupiah → rupiah strengthens.

To flee Indonesia, that same American must: (1) sell rupiah, (2) buy dollars. That’s supply of rupiah → rupiah weakens.

It’s supply and demand for the currency itself — the money doesn’t have to be spent on anything real. Just converting it to buy local stocks already moves the exchange rate.

Why It’s Called “Hot Money”

Portfolio investments (stocks, bonds) can leave overnight. FDI (factories, infrastructure) is sticky — can’t liquidate a factory in a week. Countries that rely on hot money are vulnerable.

The Other Side: Japan as Capital Exporter

Japan is the world’s largest creditor nation — it holds over $1T in US Treasuries. But Japan’s capital flows work differently from the EM story above.

Why Japan Holds Dollars

Japan runs persistent trade surpluses (exporting cars, machinery, electronics) and has negative net investment income outflows? No — Japan is a net saver with very low domestic interest rates (near zero or negative for decades). Japanese institutions — pension funds, insurers, the Government Pension Investment Fund (GPIF) — chase yield abroad. They borrow cheap in yen (0%) and lend in dollars (4%+), pocketing the spread. This is the yen carry trade.

The Bank of Japan holds dollars for a different reason: to manage the yen’s value. When the yen was strengthening in the 2010s (¥75/$ in 2011), Japan sold yen and bought dollars to weaken it and protect exporters. The accumulated dollars sit as US Treasury reserves.

The Importer/Exporter Trade-Off

A weaker yen (¥150 per dollar) is good for exporters like Toyota — each dollar of US sales converts to more yen — but bad for consumers who pay more for imported energy and food. A stronger yen (¥100 per dollar) is the reverse: importers and households cheer, exporters suffer.

Japan’s dilemma: the yen’s slide from ¥100 per dollar to ¥150 per dollar was a huge windfall for the export machine and inflated the yen value of Japan’s $1T+ Treasury portfolio. But it also drove up the cost of essential imports, squeezing households and fueling inflation for the first time in decades.

Intervention Is a Choice

When Japan intervenes to strengthen the yen (sells Treasuries, buys yen), it sacrifices:

  • Export competitiveness (Toyota’s yen revenue shrinks)
  • The yen value of remaining bond holdings (stronger yen = each dollar is worth less)
  • The carry spread (giving up 4% US yields to hold 0% JGBs)

Japan only intervenes when the yen moves too fast (disorderly), not when it’s simply “too weak.” The cost of intervention is real — selling Treasuries reduces future yen revenue from the portfolio.

Classic Cases

Asia 1997

Western banks lent billions to Thailand, Korea, Indonesia, Malaysia. Currencies were pegged to the dollar. When the dollar strengthened (Fed rate hikes) and China devalued the yuan, investors realized Southeast Asian exports were no longer competitive.

The panic was self-fulfilling:

  1. Everyone saw Thailand’s dollar reserves running low
  2. Everyone rushed to withdraw dollars at the same time
  3. Thailand ran out of reserves → devalued the baht → 50% crash
  4. Contagion: Korea, Indonesia, Malaysia all collapsed
  5. IMF bailouts with brutal conditions
  6. Some countries (Malaysia) ignored the IMF, imposed capital controls, recovered faster

Turkey (2018, 2023)

Erdogan refused to raise interest rates (called them “the mother of all evil”). Hot money funded a construction boom. When Fed raised rates and political instability grew, lira lost 80% of value, inflation hit 85%. Companies with dollar debts went bust. The “Erdoganomics” experiment failed.

Argentina (Repeatedly)

Borrowed in dollars during QE cycles → Fed tightens → dollars leave → Argentina defaults. This has happened roughly every 7 years for a century.

Taper Tantrum (2013)

When the Fed hinted it might slow QE, EM currencies crashed instantly — before any actual change in policy. This showed how fragile the system is: the expectation of tightening is enough to trigger a crisis. Emerging markets learned to build their own dollar reserves as a buffer (self-insurance).

References

  1. Rey, H. (2015). Dilemma not Trilemma: The Global Financial Cycle and Monetary Policy Independence. NBER Working Paper 21162. — Formal model showing Fed policy drives a global financial cycle that transmits to EM capital flows regardless of exchange rate regime.

  2. Calvo, G. (1998). Capital Flows and Capital-Market Crises: The Simple Economics of Sudden Stops. Journal of Applied Economics, 1(1), 35-54. — Foundational model of sudden stops in capital flows to emerging markets.

  3. US Treasury. Treasury International Capital (TIC) System. Monthly data on foreign holdings of US Treasuries, by country. Japan consistently the largest non-US holder.

  4. Bank for International Settlements. (2013). BIS Quarterly Review: International banking and financial market developments. September 2013. — Coverage of the Taper Tantrum and EM capital flow reversal.

  5. IMF. (1998). The Asian Crisis: Causes and Cures. Finance & Development, June 1998. — IMF’s own account of the Asian Financial Crisis.