Margin of Safety

Introduction

You will sometimes be wrong about a company. Margin of safety is the cushion you build in so that being wrong doesn't hurt too much. This lesson explains the concept and how to use it.

The Idea

Buy at a price well below your estimated value, so that if you misjudge the business or valuation, you still have a chance of not losing money.

Estimated value: $100
Buy only below:  $70-80  (margin of safety)

Why It Matters

• Protects against errors in your analysis
• Protects against unexpected bad news
• Gives you patience and discipline
• Reduces the emotional weight of short-term noise

Where It Comes From

You get a margin of safety from:

• A discounted price relative to conservative estimated value
• A strong balance sheet that can absorb shocks
• A durable business that can recover from setbacks

The Trade-Off

The bigger the margin, the safer — but you may have to wait longer or pass on exciting stocks trading at full value. That discipline is the point.

Using It

• Estimate value conservatively
• Set a buy zone below that estimate
• Be patient; don't chase prices above your zone
• Re-evaluate if value (not just price) changes

Summary

• Margin of safety = buying below your estimated value
• Cushions you against being wrong
• Comes from price, balance sheet strength and durability
• It requires patience and disciplined buy zones
• The cushion is designed for the days you are wrong

Next Lesson

Putting it together with a real example: a growth company.