Patience and Discipline in Trading: What Impatience Costs, Measured

Discipline in trading means following your own written rules on every trade, including the ones you do not feel like following. Patience is the part of discipline that is about time: waiting for a setup that meets the rules, letting a trade reach its exit, and holding an investment through the falls that come with it. Both are easy to agree with and hard to practice, because breaking them often feels good in the moment.

What impatience costs, in the research

Both studies cover U.S. stock investors with the trading costs of their time (Barber and Odean, 2000, PDF; Odean, 1998, PDF). They do not measure discipline directly; they measure what happened in accounts where people traded on impulse more than on rules. The cost of trading too often is detailed in the dangers of overtrading, and the pull to sell winners and keep losers in fear and greed in trading.

The gap in Barber and Odean’s study came from costs, not from bad stock picks. Before costs, the average household earned 18.7% a year, slightly more than the market’s 17.9%; after the bid-ask spread and commissions, it kept 16.4%. The average household turned over more than 75% of its stock portfolio each year, and a round trip of more than 1,000 dollars cost about 3% in commissions and 1% in bid-ask spread at the time. The households that traded least kept 18.5% a year; those that traded most, 11.4%. Commissions are far lower today, but the spread and the cost of acting on impulse are still paid on every extra trade.

Patience in numbers: holding the S&P 500

How much patience does the market ask for? We measured it on our monthly closes of the S&P 500 ETF, adjusted for dividends, from February 1993 to September 2026. The rule: for each holding period, take every possible start month, and count how many of these windows ended with a gain.

The worst window did not shrink steadily: −16.5% over one month, −43.4% over 12 months and −45.3% over 24 months, then −29.6% over 10 years. Every 15-year and 20-year window ended higher, the worst by 71.8% and 150.2%; with 224 and 164 heavily overlapping windows, that is a short record.

The longer the holding period, the more often it ended with a gain, but not always: 24 of the 10-year windows still lost money, all of them starting between November 1998 and October 2000, near the 2000 peak, and ending between November 2008 and October 2010, after the 2008 crash. The windows overlap, so a single bad period counts many times, and 33 years hold only three separate 10-year stretches. Read the chart as what this one market did over this one period, not as a promise.

What patience had to sit through

Three falls of 20% or more on month-end closes: from August 2000 to September 2002, −44.7%, back to the peak in November 2006; from October 2007 to February 2009, −50.8%, back in March 2012; from December 2021 to September 2022, −23.9%, back in December 2023. The chart splits each one into the months spent falling and the months spent climbing back.

These are the falls of 20% or more on month-end closes over the same period. The 2020 crash does not appear: measured from the December 2019 close to the March 2020 close it was −19.4%, because month-end prices miss the lows inside the month. The point for a trader is the length, not only the depth: about six years from peak to recovery in the first case and four and a half in the second. Daily falls and recoveries for the S&P 500 and the Dow are measured in blue chip stocks vs. the S&P 500.

Patience inside a trade

• Waiting for the setup. Trade only what your plan describes, at the level it describes. A missed trade costs nothing; a forced one costs the spread, the commission and often the stop.
• Waiting for the entry. If the plan says to enter on a close above a level, wait for the close, not the first tick above it.
• Waiting for the exit. Let the trade reach its target or its stop. Moving the target closer because you are nervous cuts the reward side of your risk-reward ratio.
• Waiting out a losing streak. Even a sound strategy loses several trades in a row, as the example below shows.

The chance of a long streak depends on the win rate. At a 40% win rate, a run of 6 losses within 100 trades has an 87.3% chance and a run of 8, 49.0%; at 60%, 21.2% and 3.6%. These figures assume independent trades; they come from counting every sequence of 100 wins and losses, not from market data.

Eleven habits of disciplined traders

None of these habits needs talent. They need a written plan to check yourself against; see trading plan. Whether professionals rely on charts at all is discussed in do professional traders use technical analysis.

How to build discipline

1. Write the rules: what you trade, when you enter, where you exit, how much you risk.
2. Place the stop and the target when you enter, so that the decision is made before the emotion arrives.
3. Set a daily limit on losses and on the number of trades.
4. Review each week: count the trades that broke a rule, and what they cost.
5. Start small or on a demo account, and increase size only after a run of trades that followed the rules.

The routine below puts these steps in the order of a trading day: before the open, read the rules, set the day’s limits and mark the setups; during the session, let the rules decide and put new ideas on paper; after the close, score each rule as followed or broken and carry one change into the next session.

Some traders use short written reminders before each session; see trading affirmations. More on the mental side of trading in trading psychology, and on the markets you can apply it to in asset classes.