Why does avoiding a permanent loss matter more than chasing returns?

The math is the starting point. Lose half, and you need to double just to get back to where you started. A portfolio that loses 8% in a bad year can keep compounding. One that loses 35% spends the next half-decade recovering.

Preservation isn't about being conservative. It's a discipline applied position by position, across cycles. That means underwriting the worst plausible case, sizing so a single position going to zero doesn't damage the book, and documenting the exit before committing capital.

Most preservation work happens in the deal you didn't do. Sometimes the right call is to exit at a loss now, before it becomes a larger one. A discipline you can describe in advance is one you can hold under pressure.