What Is the Hang Seng Index?
The Hang Seng tracks the largest Hong Kong-listed companies by market value, with heavy exposure to Chinese firms. How it works, what moves it, how it trades.
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Why the FTSE 100 Often Moves Opposite to the Pound
Many FTSE 100 companies earn abroad, so a weaker pound raises their sterling earnings and often lifts the index. How the link works and when it breaks down.
What Is the EURO STOXX 50?
The EURO STOXX 50 tracks 50 of the largest euro area companies by market value. How it differs from the DAX and FTSE 100, what moves it and how it trades.
Why the DAX Is So Sensitive to Global Trade
Germany leans on manufacturing, autos, chemicals and exports, so the DAX reacts strongly to global demand, China, tariffs and energy prices. How the links work.
What Happened on Black Monday 1987?
On October 19, 1987, the Dow fell 508 points, or 22.6%, its largest one-day percentage drop. The causes, portfolio insurance and the circuit breakers after.
What Caused the 2010 Flash Crash?
On May 6, 2010, the Dow fell nearly 1,000 points in under half an hour, then recovered. Regulators traced it to a $4.1 billion automated futures sale.