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What is the largest ever single-day decline of a major currency?

Historical Perspective: Major Currency Tumbles in Recent Decades

The landscape of global finance is frequently shaken by substantial shifts in currency values. Among these, the “Black Wednesday” event of 16 September 1992 is particularly noteworthy. On this day, the British pound Sterling witnessed a dramatic decline, falling over 15% against the German mark. This event was precipitated by the UK government’s failure to keep the pound within the European Exchange Rate Mechanism (ERM), leading to the UK’s subsequent exit from the ERM. This occurrence marked the largest single-day drop in a major currency at that time.

Other significant instances of currency devaluation include the over 10% drop of the US dollar against the Japanese yen on 20 October 1998, and the Australian dollar’s 8% fall against the US dollar on 27 October 1997. These examples, while notable, must be viewed within the broader context of the constant fluctuations that characterize currency markets.

A key event in recent financial history was the Swiss National Bank’s (SNB) decision to unpeg the Swiss Franc from the euro on 15 January 2015. Prior to this, the Franc was pegged at 1.20 to the euro, a measure taken to counter the euro’s weakness and avert deflation. The unexpected removal of this peg led to a sharp 30% appreciation of the Franc against the euro and a significant 15% increase against the US dollar. This abrupt adjustment inflicted considerable losses on currency traders and banks who had speculated on the Franc’s stability.

In the aftermath of the SNB’s decision, the currency markets experienced a period of heightened volatility. However, the situation normalized relatively swiftly. The Franc’s previously suppressed value due to the peg was corrected, allowing it to align with its true market value. To mitigate excessive appreciation and stabilize the Franc, the Swiss central bank intervened by acquiring foreign currencies.

These currency fluctuations have far-reaching economic impacts. For instance, the Swiss economy grappled with the repercussions of the Franc’s appreciation, as it made Swiss exports costlier, resulting in a decline in export activities and a slowdown in economic growth. These instances highlight the intricate relationship between currency market dynamics and global economic trends.

“If you have a 10% chance of a 100x return, you should take that bet every time – even if it’s going to feel bad 9 out of 10 times.” – Jezz Bezos

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