Who it's for — Anyone who has just opened their first trade and panicked seeing their account immediately go a few bucks into the negative. No one stole from you: you just paid the toll to enter the highway.
In the previous lesson, we saw that the bid-ask-spread is the empty space between buyers and sellers. Now let's see how that space transforms into a real cost, in dollars or euros, deducted directly from your account.
In simple terms — The market always makes you buy at the worst available price (Ask, the highest) and sell at the worst available price (Bid, the lowest). The difference between the two is your entry (and exit) cost.
The Initial Negative P&L
If you buy at the market, you pay the Ask (e.g., $100.04). In the exact moment your order is executed, your asset is worth $100.04 to you, but if you wanted to sell it back instantly, the market would only pay you the Bid ($100.00).
Result: your account (P&L - Profit and Loss) will immediately show a -$0.04. For you to "break even", the entire market must rise by at least $0.04, moving the Bid to $100.04. Only from that moment on will you start generating real profit.
Why it is crucial to consider it
Many amateur traders ignore the spread because "it looks small". But the spread kills strategies (especially scalping) for two reasons:
- You pay it (often) twice: You enter paying the spread. You exit (perhaps with a market Stop Loss) paying the spread again, which in the meantime may have widened due to volatility.
- It impacts the Risk/Reward: If your profit target is 10 ticks and the spread is 2 ticks, you have just surrendered 20% of your potential profit to the market, just for participating.
| Trading Style | Spread Impact | Practical Consequence |
|---|---|---|
| Scalping (Trades lasting seconds) | Devastating | Requires ultra-liquid markets (near-zero spread) or fixed commissions. |
| Day Trading (Trades lasting hours) | Relevant | Affects final P&L, must be factored into position size. |
| Swing Trading (Trades lasting days/months) | Negligible | A spread of a few cents doesn't ruin a +15% target. |
Example — On some minor cryptocurrencies (illiquid Altcoins), the spread can reach 2% or 3%. This means as soon as you click "Buy", you are down 3%. The price must make a +3% just to get you back to break-even. You are starting the race with an iron ball chained to your ankle.
Summary Sheet
- What it is: The economic effect (the cost) of the Bid-Ask gap on your trading account.
- What it's for: To calculate the true cost of a trade, adding it to the broker's commissions.
- Golden Rule: Never trade instruments with wide spreads using low time-frames (Scalping). You will bleed out from the costs.
Bronze Path — This concludes Module 1. Now you know exactly what and who you are fighting against. Move on to Module 2: How price moves. Return to index: bronze-path.
Links
- bid-ask-spread — The mechanical cause (the void in the book).
- commissions — The other obvious cost of trading.
- slippage — When the cost becomes even greater than the spread.
- bronze-path
- concepts