The most influential factors
- Interest rates: raising them attracts capital and strengthens the currency.
- Inflation and economic data: shape rate expectations.
- Central-bank policy: its statements move the market strongly.
- Political stability and risk: affect investor confidence.
Why does a currency fall on good news?
This is the question that most confuses new traders, and its answer is the key that makes the rest of this page make sense: the market does not move on the news, but on the gap between the news and the expectation already priced in. Today's price already contains what participants expect tomorrow; if reality matches expectation there is no reason for a large move, because the move already happened.
| Expected | Actual | Likely direction | Why |
|---|---|---|---|
| +0.50% hike | +0.50% hike | Limited movement | Fully priced in |
| +0.50% hike | +0.25% hike | Currency weakens | Less than expected, though still a hike |
| Hold | +0.25% hike | Currency strengthens | An unpriced positive surprise |
| +0.25% hike | +0.25% and hawkish tone | Stronger still | Future expectations shifted |
Note the second row in particular: a rate hike weakened the currency. That is not an anomaly but the rule, and anyone unaware of it will read the market backwards again and again. The practical rule: before any event, ask "what is priced in?" rather than "what is the news?"
Ranking the drivers: impact and time horizon
Not all drivers are equal, and they do not operate on the same horizon. Confusing them leads traders to base a short-term decision on a factor that works over months:
| Driver | Mechanism | Horizon | Impact |
|---|---|---|---|
| Rate decisions and central-bank tone | Capital flows toward higher yield | Weeks to months | Highest |
| Inflation (CPI) | Shifts expectations for coming rates | Days to weeks | High |
| Employment and growth | Feeds the same expectations, less directly | Hours to days | Medium to high |
| Safe-haven flows | Flight from risk during crises | Hours to weeks | Variable and sharp |
| Sentiment and liquidity | Temporary supply/demand imbalance | Minutes to hours | Low, but it makes the noise |
In practice: the upper drivers set your bias (whether to look for buys or sells at all), the lower ones set timing and cannot support a directional view. And when the other currency in the pair is driven by a stronger force, that side will lead the move — see reading a currency pair.
Putting it to use
Follow the economic calendar to know when impactful events land, and before each major event record two numbers: the published consensus, and the level that would change your view. This understanding sets a currency's broad bias, while technical analysis helps with timing.
Three practical notes on trading around news: the spread widens at that exact moment, raising your cost (details here); the first move after a release often reverses within minutes as the detail is read rather than the headline; and most disciplined traders prefer to wait for liquidity to settle rather than enter in the first second.