What moves EUR/USD the most?

The expected divergence between ECB and Fed monetary policy is the dominant driver, closely tracked by the US–German short-term yield spread.

Why is EUR/USD called 'Fiber'?

It is a market nickname, a play on 'Cable' (the historic name for GBP/USD). The origin is informal industry slang.

When is EUR/USD most active?

During the London–New York session overlap, when liquidity and volume peak.

EUR/USD

“Fiber”

Euro / US Dollar

EUR/USD is the world's most traded currency pair, driven primarily by the policy divergence between the ECB and the Federal Reserve.

EUR/USD is the most liquid and most traded currency pair in the world, representing the exchange rate between the euro and the US dollar — the two largest reserve currencies. Its depth means tight spreads and that it often sets the tone for the broader dollar complex.

The pair is fundamentally a relative story: it rises when the euro is expected to outperform the dollar and falls when the dollar is favoured. Because both sides are major reserve currencies backed by large, transparent central banks, EUR/USD is driven more by the expected divergence in monetary policy than by either economy in isolation.

What moves EUR/USD

ECB vs Fed policy divergence
The single biggest driver — the gap between expected ECB and Fed rate paths sets the carry and the trend.
Relative inflation & growth
Euro-area and US inflation and growth surprises shift expectations for each central bank.
Risk sentiment & the dollar
In broad risk-off episodes the dollar's safe-haven bid can weigh on EUR/USD regardless of European data.
Rate-differential / yield spread
The US–German 2-year yield spread is a close proxy for the pair's fair value.

Trading sessions

Liquidity is deepest during the London–New York overlap (roughly 13:00–17:00 UTC), when the largest share of EUR/USD volume trades and moves are most reliable.

Volatility

EUR/USD is typically the lowest-volatility major because of its enormous liquidity, but it can move sharply around ECB and FOMC decisions, euro-area and US inflation prints, and US payrolls.

Central banks behind this pair

EUR/USD FAQ

What moves EUR/USD the most?: The expected divergence between ECB and Fed monetary policy is the dominant driver, closely tracked by the US–German short-term yield spread.
Why is EUR/USD called 'Fiber'?: It is a market nickname, a play on 'Cable' (the historic name for GBP/USD). The origin is informal industry slang.
When is EUR/USD most active?: During the London–New York session overlap, when liquidity and volume peak.

Related currency pairs

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