Munger's core operating modelsPart I

The cancer-surgery model

Sometimes the value-creating move is to cut away everything mediocre and keep only the few excellent parts.

Munger uses this metaphor for restructuring companies and portfolios. A surgeon dealing with cancer doesn't try to improve the diseased cells. They remove them. The patient is healthier afterward because the bad parts are gone, not because the good parts got better.

In business, the same logic applies to divisions, products, customers, employees, and habits that are mediocre or worse. Most operators try to improve their mediocre divisions. Munger's argument: most of the time, you can't. The mediocre stays mediocre, no matter how much management attention you throw at it.

The harder but more value-creating move is to cut. Sell the underperforming division. Discontinue the unprofitable product line. Let the underperforming customers go. Fire the underperforming people. Stop the habits that don't compound. Keep only the excellent.

The reason this is hard isn't analytical. The numbers usually agree. It's emotional. The mediocre division has employees and history. The unprofitable product has customers who care. The underperforming employee has been there for years. Cutting feels brutal, especially when there's no specific catastrophic failure to point to.

But the math is brutal too. Mediocre parts of a company drag down the excellent parts via management attention, capital allocation, and culture. Removing the bad doesn't damage the good; it usually unleashes it.

The cancer-surgery move is what Munger and Buffett did to Berkshire's original textile business. They eventually shut it down rather than keep limping along. The capital and attention freed up funded the next 50 years.

Examples in the wild