Capital flows & sudden stops
The same script, different countries
Capital crossing borders is the lubricant of global growth and the accelerant of every emerging-market crisis. Same flows; different signs.
When a country looks attractive — high growth, stable politics, cheap factor costs — capital floods in. Local currency strengthens, asset prices rise, lending booms.
When perceptions flip — a weak data point, a contagion from elsewhere, a regime change — capital reverses. The same flow that was investment is now flight. Currency collapses, asset prices fall, lending freezes. The historical record shows this isn't gradual erosion — it's a cliff.
Calvo's "sudden stops" research showed this is the dominant pattern in EM crises: not gradual erosion, but a cliff. The 1997 Asian crisis, 1998 Russia, 2001 Argentina, 2018 Turkey, 2022 Sri Lanka all share this shape.
When the cliff arrives, central banks have two options: defend the exchange rate (sell reserves, hike rates aggressively) or let the currency float. Reserves are finite; you can't defend forever. Successful defenses are rare (Hong Kong 1997 is the canonical case, and it took an extreme rate posture). Most attempted defenses end with the currency breaking anyway plus the reserves being gone.
If your debt is in dollars and your income is in pesos, you are the FX position.
If you live in an emerging market, your local currency mortgage is denominated in something that can lose 30% in a quarter. Hard-currency debt looks cheaper until the swing — and then it doesn't. The widget below shows you the cascade.
See three EMs side-by-side
The fingerprints of a sudden-stop-prone country show up early on the routine indicators — high inflation, negative current account, rising debt. Put three EMs side-by-side and the divergence is loud.