Opportunity Cost
Opportunity cost is the profit you give up by not trading, missing fills or tying up capital. Learn how to measure it and balance it against trading costs.
Opportunity cost is the value of the best alternative you gave up. In trading, it shows up in three ways: trades you missed because an order did not fill, trades you skipped out of hesitation, and capital tied up in a position that could have earned more elsewhere. It never appears in your account, which is exactly why it is so easy to ignore and so expensive in practice.
Three kinds of opportunity cost#
| Kind | Example | How to measure |
|---|---|---|
| Missed fills | A limit order a few cents away never fills, and the stock rises 8% | Result of the trade if it had filled at the planned price |
| Skipped setups | A valid signal is ignored after two losses | Result of the plan trade you did not take |
| Tied up capital | Money sits in a stagnant position or idle cash | Return the money could have earned in your next best use |
Missed fills: patience has a price#
Passive limit orders save the spread but sometimes miss trades entirely. Because the trades most likely to run away from you are often the best ones, missed fills can cost more than the spreads saved.
This is the reasoning behind Implementation Shortfall, which counts unfilled shares as a cost.
Skipped setups: the cost of hesitation#
After losses, many traders start skipping valid setups. If the skipped trades have the same expectancy as the rest of the plan, every skip costs expected profit, and the trades that get skipped are often the ones after a losing streak, when the plan is just as valid. See Hesitation and Fear and Greed.
Tied up capital#
A position that goes nowhere for months is not free just because it is not losing money. That capital, and the risk attached to it, could have been used for better opportunities. Many traders use a time stop: if a trade has not worked within a set period, they exit and free the capital.
Balancing opportunity cost against trading costs#
Every execution decision is a trade off:
| Choice | Lowers | Raises |
|---|---|---|
| Aggressive orders (market, marketable limit) | Opportunity cost | Spread and slippage |
| Passive orders (resting limit) | Spread and slippage | Opportunity cost |
| Waiting for confirmation | Bad trades | Missed moves, worse entries |
| Trading more setups | Opportunity cost | Transaction costs, risk |
The right balance depends on your strategy. For trend and breakout strategies where winners can be large, missing trades is expensive, so leaning aggressive often makes sense. For mean reversion strategies with small, frequent profits, saving the spread matters more. See Market vs Limit Orders.
How to measure it in your journal#
- Log every planned trade that did not happen and why: limit not filled, skipped, too late.
- Record what the trade would have done if taken according to your plan.
- Compare the total with the costs you saved by being passive or cautious.
Frequently asked questions#
What is opportunity cost in trading?#
The profit given up by missing trades, skipping setups or keeping capital in a less productive position than the best available alternative.
How do I reduce opportunity cost?#
Use more aggressive orders for high value setups, follow your plan consistently after losses and use time stops to free capital from stagnant positions.
Is cash an opportunity cost?#
Holding cash has an opportunity cost if it could earn more elsewhere, but cash also reduces risk and keeps you ready for future opportunities.
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Mentioned in
- Time StopsPosition Management