The Shortest Line
on the Chart
Five Asian crashes on one axis, and Korea's is the worst that has ever happened. It is also the only one that has not finished.
A chart went around this morning comparing Korea's 2026 decline with the four largest equity collapses in modern Asian history. Each series is anchored at its own pre-event peak and followed forward for fifty trading sessions. Korea's line falls faster and further than any of them, and the accompanying claim was that this is now the worst crash in Asian financial market history.
Inside that window, the chart is right. Nothing in the comparison set fell 38.6 percent in twenty-seven sessions. Korea did.
The window is the whole claim. Korea's line is the shortest one on the chart, because Korea's crash is the youngest by eleven years. The other four had not finished falling when the window closed. Three of them had barely started.
01 Where each line actually ended
Follow the same five series past fifty sessions and the ranking inverts. Korea's 38.6 percent is the shallowest decline of the five, not the deepest. The Nikkei lost 81.9 percent from its 1989 peak. Hong Kong lost 65.2 percent from 2007, Korea itself lost 64.7 percent in the Asian financial crisis, and Shanghai lost 52.3 percent after 2015.
The time axis tells a second story that fifty sessions cannot. The Nikkei took nineteen years to reach its floor and thirty-four years to see its 1989 level again. Shanghai has not recovered its 2015 peak and is now eleven years out. Korea's 1997 crash, the deepest of the four in percentage terms after the Nikkei, was fully recovered inside two years.
| Event | At session 29 | Eventually | Time to the floor | Back to the peak |
|---|---|---|---|---|
| Kospi, 2026 | -31.4% | -38.6% | 1 months | Not yet |
| Shanghai, 2015 | -21.2% | -52.3% | 4 years | Not yet, still |
| Hang Seng, 2007 | -9.9% | -65.2% | 12 months | 10 years |
| Kospi, 1997 | -7.5% | -64.7% | 12 months | 22 months |
| Nikkei, 1989 | -3.7% | -81.9% | 19 years | 34 years |
Depth and duration are different questions, and neither is the question a fifty-session window answers.
02 Move the window
The useful way to see this is not to argue about which frame is correct. It is to watch the title change hands.
Instrument
Stop the clock, and see who is worst
Five events, each measured from its own pre-event peak. Drag to change where the measurement stops. Everything to the right of the cut still happened; it is simply not being counted.
Ranked by decline from that event's own peak, measured at the session above.
Between the fifth session and the fifth year, the worst of the five changes hands five times. Shanghai holds it first. Korea takes it around the twentieth session and holds it through the end of its own record. Shanghai takes it back at fifty. Korea's 1997 crash leads at a hundred and twenty, Hong Kong at three hundred, and from roughly the second year onward the Nikkei owns it and never gives it up.
Every one of those statements is true. They describe the same five events, from the same peaks, in the same currency.
03 Why this keeps happening
A superlative is not a fact about a market. It is a fact about a market and a window, and the window is usually chosen by whatever is convenient: the length of the shortest series, the width of a chart, the period a data vendor happens to return.
The convenient window here is fifty sessions, and fifty sessions is roughly how long Korea's decline has existed. That is not a coincidence, and it is not anyone acting in bad faith. A comparison has to end somewhere, and the newest member of the set is what decides where.
The result is a chart that can only ever say the newest crash is the worst one. Add a sixth event tomorrow and the window shortens again, and the sixth event wins.
There is a sharper version of this, visible in the original chart if you look at where Korea's line stops. It ends at session twenty-seven, which is July 30. The following session, July 31, the index rose 17.9 percent, the largest single-day gain in its history, which would have carried that endpoint from minus 38.6 percent to minus 27.6 percent. The chart is not wrong and it is not stale. It simply ends one session before the largest rally the series has ever recorded, because that is where the data stopped when it was drawn.
Nothing about the Nikkei in 1990 told you it would take thirty-four years. Nothing about Korea in 1998 told you it would take two. The difference between those two outcomes is not visible in any fifty-session window, and it is the only difference that mattered to anyone holding either one.
Alec Messino
Driftwood Wealth
The longer argument, on one index over one month, is in The Interval Problem →
Data: Daily closing levels for the Nikkei 225, Hang Seng, Shanghai
Composite and Kospi Composite, retrieved from the Yahoo Finance chart API. Each event is
anchored at the highest close inside a stated window around its pre-event peak, so the
anchor is found in the series rather than asserted from a date: Nikkei December 29, 1989;
Hang Seng October 30, 2007; Shanghai June 12, 2015; Kospi June 17, 1997; Kospi June 22,
2026. Every figure and the exhibit are computed by scripts/asia_drawdowns.py
rather than entered by hand. Returns are price returns in local currency and exclude
dividends, which is how the comparison is normally drawn and which understates the total
return of every series.
Limits: Recovery is measured as the first close at or above the starting peak, in nominal local-currency terms. It does not adjust for inflation, and on that basis the Nikkei's 2024 recovery is considerably further away. Time in years assumes 246 trading sessions. The comparison set is the one used in the chart this piece responds to, not an exhaustive list of Asian drawdowns. Past performance does not indicate future results. This material is for informational purposes only and is not investment advice or a recommendation.