A sharp move in one pair can be the visible edge of a wider repricing. The useful question is not simply which chart moved first, but which shared driver could connect the markets—and what evidence would disprove that explanation.
Follow the evidence
Trace how the event could reach markets, then inspect a competing explanation.
Compare explanations
Switch lenses to see what each account explains—and what remains uncertain.
A practical review starts with the event calendar, interest-rate expectations and the currencies that are strengthening or weakening broadly. Then compare the move with relevant yields, commodities and risk-sensitive assets. BIS market surveys are useful context for the structure of global FX, but they do not explain a particular day’s price action. If several pairs move together, that may reflect a common dollar or risk factor. It does not guarantee that the relationship will continue through the next session or data release.
A practical review starts with the event calendar, interest-rate expectations and the currencies that are strengthening or weakening broadly. Then compare the move with relevant yields, commodities and risk-sensitive assets. BIS market surveys are useful context for the structure of global FX, but they do not explain a particular day’s price action. If several pairs move together, that may reflect a common dollar or risk factor. It does not guarantee that the relationship will continue through the next session or data release.
Ask which observation would confirm the proposed driver, which would weaken it, and whether the timing lines up. Compare like-for-like periods and note when local news becomes more important than the shared factor. Historical correlation can help describe a relationship over a chosen window. It cannot, by itself, establish causation or provide a reliable entry signal.
Pairs are connected through their currencies
A currency pair is a relative price: EUR/USD combines the euro and the dollar, while GBP/USD shares the dollar leg. A broad change in demand for USD can therefore appear across several pairs at once. Cross rates and hedging flows create further links between markets.
That connection is a map of possible transmission, not proof that one price move caused another. Domestic data, market liquidity and positioning can make the response different from pair to pair.
Look for a shared driver before a shared trade
A practical review starts with the event calendar, interest-rate expectations and the currencies that are strengthening or weakening broadly. Then compare the move with relevant yields, commodities and risk-sensitive assets. BIS market surveys are useful context for the structure of global FX, but they do not explain a particular day’s price action.
If several pairs move together, that may reflect a common dollar or risk factor. It does not guarantee that the relationship will continue through the next session or data release.
Check whether the relationship still holds
Ask which observation would confirm the proposed driver, which would weaken it, and whether the timing lines up. Compare like-for-like periods and note when local news becomes more important than the shared factor.
Historical correlation can help describe a relationship over a chosen window. It cannot, by itself, establish causation or provide a reliable entry signal.