Drawdown: the number that decides if you stick with a strategy

The lesson in plain words

The same lesson as the slides above, written out in full.

1. Drawdown

Welcome. Drawdown measures the decline from a peak to a subsequent trough. In plain terms, it is the worst loss an investment or portfolio experienced before it recovered. It might sound like a technicality, but it is often the number that decides whether you will actually stick with a strategy. Because a paper loss feels abstract on a spreadsheet, and very real when you are living through it. One note before we begin. This is financial education only, not financial advice.

• Drawdown measures the decline from a peak to a later trough.
• It tells you the worst loss an investment took before recovering.
• It is often the number that decides whether you actually stick with a strategy.

A quick note: This is financial education only, not financial advice. Do not buy, sell, or hold anything based on this lesson.

2. Peak to Trough

Let us make it concrete. Drawdown is the fall from a peak, expressed as a percentage of that peak. If your portfolio reached two hundred thousand dollars and then fell to a hundred and fifty thousand before recovering, the drawdown was twenty five per cent. You lost a quarter of your peak value. On paper, twenty five per cent sounds manageable. In practice, watching fifty thousand dollars disappear, month after month, is a genuine test of character. That gap between the theory and the lived experience is exactly why drawdown matters.

• Drawdown is the fall from a peak, measured as a percentage of that peak.
• If a portfolio reaches $200,000 and falls to $150,000, the drawdown is 25%.
• The percentage sounds manageable in theory.
• In practice, watching $50,000 disappear is a test of character.

3. Losses Are Asymmetric

Here is the maths most people do not grasp intuitively. Losses are asymmetric. A twenty per cent loss needs a twenty five per cent gain to recover. A thirty three per cent loss needs a fifty per cent gain. And a fifty per cent loss needs a full one hundred per cent gain just to get back to where you started. The deeper the drawdown, the disproportionately harder it becomes to climb out. This is precisely why risk management, things like position sizing and diversification, is not optional. The primary job of an investor is to avoid the catastrophic drawdowns. Survive, and the returns tend to take care of themselves.

• Losses are asymmetric: the gain needed to recover grows faster than the loss.
• A 20% loss needs a 25% gain; a 33% loss needs 50%.
• A 50% loss needs a full 100% gain just to break even.
• The deeper the hole, the disproportionately harder the climb out.

4. How Bad Is Bad

So how do you read severity? Under ten per cent is normal fluctuation, the kind of thing you should expect several times a year in equities. Ten to twenty per cent is a correction, uncomfortable but common. Twenty to thirty per cent is bear market territory, where many investors start panic selling and lock in their losses. Thirty to fifty per cent is a severe bear market, think 2008 or early 2020, and these take years to recover from. Above fifty per cent is catastrophic. The Nasdaq once fell seventy eight per cent, and a loss like that needs a three hundred and fifty five per cent gain to recover, which took about fifteen years. At that level the question is not recovery, it is survival. Which is the whole point of avoiding the deep end.

• Under 10%: normal fluctuation, expected several times a year.
• 10 to 20%: a correction, uncomfortable but common.
• 20 to 30%: bear market, where many panic-sell and lock in losses.
• 30 to 50% and beyond: severe to catastrophic; a 78% fall needs a 355% gain, and can take over a decade to recover.