New traders assume markets are simple: good news pushes price up, bad news pushes it down. Then they watch a currency fall on a great economic report and feel betrayed. Over a century ago, G.C. Selden gave this puzzle a name — inverted reasoning — and understanding it will save you a lot of confusion.
What inverted reasoning means
In his 1912 classic The Psychology of the Stock Market, Selden observed that experienced operators "apply a kind of inverted reasoning to almost all stock market problems." Instead of reacting to news at face value, they ask what the news means for who is already positioned and what has already been priced in.
His example: after a strong rally, the small traders are all bullish — so someone must have sold them their positions. When bullish news finally arrives, the seasoned trader thinks, "So this is what they were buying on — it's already discounted by the rise," and may even sell into the good news.
Why markets move "the wrong way"
This is why price so often does the opposite of what the headline suggests. Two forces are at work:
- Discounting. Markets are forward-looking. By the time good news is public, price may already reflect the expectation of it — so the actual release brings no new buying.
- Positioning. If nearly everyone is already bullish and holding, there's little fuel left to push price higher. The news becomes an exit opportunity, not an entry.
The result: a currency can drop on a genuinely good report, simply because the good outcome was already expected and priced in.
The modern version: "buy the rumour, sell the news"
Selden's inverted reasoning is the ancestor of a phrase every modern trader knows: "buy the rumour, sell the news." Traders position ahead of an expected event (the rumour), and when the event actually happens (the news), they take profits — pushing price the "wrong" way relative to the headline.
This is exactly why, in forex, it's the surprise versus expectations that moves price, not the raw number. A strong figure that merely matches what was expected can leave a currency flat or falling.
Warning
Reacting to news at face value is a beginner's trap. The market isn't trading the news — it's trading the gap between the news and what everyone already believed.
How to use this idea
You don't need to outguess institutions to benefit from inverted reasoning:
- Ask what's already priced in before assuming news will move price your way.
- Watch the reaction, not the headline. How price responds to news tells you more than the news itself.
- Be cautious when everyone agrees. Extreme one-sided sentiment often means the move is already crowded.
Risk
Understanding inverted reasoning doesn't let you predict the market — it just stops you from being repeatedly surprised. Always trade with a plan and a stop loss, not with a headline.
Timeless psychology, modern tools
The crowd behaviour Selden described a century ago still drives markets today. A regulated broker with a free demo lets you observe how price really reacts to news before risking money on the headline.
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