Market Foundations

When you buy EUR/USD with a broker you are usually not buying euros. You are entering a contract for difference — an agreement to exchange the change in price between opening and closing. That has three consequences most beginners never have explained to them.

One: your broker is often your counterparty. Your loss can be their gain. That is not automatically sinister, but it means execution quality matters and you should prefer regulated brokers with transparent pricing.

Two: you are trading on margin. A 1:100 account lets KSh 10,000 control KSh 1,000,000 of currency. A 1% adverse move does not cost you 1% — it costs you 100% of your capital.

Three: positions have a carrying cost. Hold overnight and you pay or receive swap based on the interest-rate differential. Hold a losing position for weeks "until it comes back" and swap quietly eats the account while you wait.

The takeaway: leverage is not a feature that makes you money faster. It is a multiplier on an edge you have not proven yet — which usually means it multiplies losses.

Every round trip costs you three things: the spread, any commission, and slippage (the gap between the price you wanted and the price you got). On a major pair the spread might be 1 pip. That sounds trivial. It is not.

Do the arithmetic. If your strategy targets 5 pips per trade and pays 1 pip in spread, you are handing over 20% of your gross profit on every single trade. To break even you now need to win far more often than a coin flip. Push to 20 trades a day and costs, not the market, decide your outcome.

This is not theory for us. We tested a mean-reversion scalper on five-minute charts across twelve currency pairs. It won 77% of its trades — and still lost money, because the profit target was small relative to the stop and the costs. Zero of twelve pairs were profitable after costs.

The takeaway: before you evaluate any strategy, calculate what it pays in costs per trade as a share of its average win. If that number is above roughly 15%, the strategy has to be exceptional just to reach break-even.

Stop thinking in money. Start thinking in R, where 1R is the amount you lose if your stop is hit. If you risk KSh 1,000 per trade, a win of KSh 2,000 is +2R and a loss is −1R.

This one change fixes several problems at once. It makes trades comparable across instruments and account sizes. It stops you judging a good decision by a bad outcome. And it makes expectancy calculable:

Expectancy = (Win% × AvgWin_R) − (Loss% × AvgLoss_R)

A strategy winning 36% of the time with +3R winners and −1R losers has an expectancy of (0.36 × 3) − (0.64 × 1) = +0.44R per trade. It loses roughly two trades out of three and is still excellent. Meanwhile a 90%-win-rate strategy with −9R losers is a slow-motion disaster.

The takeaway: win rate on its own tells you nothing. Anyone quoting it without the R-multiples is selling, not teaching.

Human brains find patterns in noise — it is what they are for. Show a trader a random walk and they will find head-and-shoulders, support and resistance, and a trend line. This is why "it looks obvious on the chart" is the most expensive sentence in trading.

Two disciplines protect you. First, state the rule before you look. "Buy when price closes above the highest high of the last 20 bars" is testable. "Buy when the trend looks strong" is not — it will mean whatever you need it to mean after the fact.

Second, look at the failures. Scroll back through a year of chart and count the times your pattern appeared and did not work. Most people only remember the ones that did. That is survivorship bias operating on your own memory.

The takeaway: if you cannot write your rule in one sentence that another person could code without asking you a question, you do not have a rule yet.

A plan is not a prediction. It is a set of decisions made in advance, while you are calm, about what you will do when you are not. At minimum it answers five questions.

1. What is the setup? One sentence, testable. 2. Where is the stop? Decided before entry, placed in the order, never widened. 3. How large is the position? Derived from the stop distance so every trade risks the same R. 4. Where do you exit a winner? Fixed target or a trailing rule — chosen in advance. 5. When do you stop trading? A daily loss limit, in R, that ends the session regardless of how you feel about it.

Notice what is absent: any opinion about where the market is going. A plan is a machine for converting an edge into outcomes. Opinions are what you use when you do not have one.

The takeaway: write the plan down. A rule you keep in your head is a rule you will renegotiate at exactly the moment it matters.