Saturday, May 16, 2026

Explaining Your Strategy To A Child

Michael Sonnenfeldt from Tiger 21 wrote a guest essay for Barron's about whether or not to establish a family office. The main point about needing a family office probably isn't germane to what we do here but he had some pretty good one liners that are worth sharing. 

1) Intelligent discipline beats brilliance. Process is repeatable. Genius isn’t.

We talk all the time about process. I would add the idea of simplicity to this point. I think anyone's investment process should be simple relative to their own experience and capacity. I don't think Cliff Asness thinks what AQR does is simple but none of us are Cliff Asness. I first learned about the idea of simplicity in this context from Peter Lynch in the 1980's. Paraphrasing, you should be able to explain your process to a child. 

2) Position sizing is the sharpest risk tool

Yes. This point is an essential building block for understanding how to manage risk. I'll reference a reader comment from 2006 who put 25% of his portfolio into Pozen, betting on a migraine treatment. There was bad FDA news and the stock fell by 61%. He put 1/4 of his money into a lottery ticket. It's hard to be critical of making the bet but the sizing was catastrophically bad. 

3) If you can’t explain your edge, index proudly

I don't take this literally. Indexing is of course valid but so too are plenty of other simple strategies. Ideally, a portfolio only needs to be tweaked occasionally versus a lot of churn. This is why so much of the content on CNBC as well as a lot of stock market websites should be avoided. They try to get you to trade more which is the wrong thing for so many people. I would rephrase number 3 to build a portfolio you can live (sleep) with that doesn't require constant trading. 

If I have an edge, I don't love that word, I think it is avoiding or being seriously underweight areas where the risk of something terrible happening is high. Hopefully that is repeatable in the future but I have had this luck in the past.

And because I think there is a connection, the CEO of the Harvard Management Company, the endowment, announced he is retiring. The link includes a little bit about the performance which has run at close to 8%. The comments, it's a WSJ article, piled on about how far behind the S&P 500 the endowment has been. 

The endowment doesn't benchmark to the S&P 500. Apparently, the HMC targets an 8% return to account for inflation and the amount of the school's budget it covers. It's fair game to wonder whether that is the appropriate target or not but that's what it is. 

One point we've made here before is that there are things to learn from how endowments allocate but I don't think they should be emulated. One reason is that we do not have access to the private equity and venture managers that Harvard does. The other is that we are not managing for an infinite time horizon the way a college endowment should be doing. 

The idea of targeting 8% or some other number is difficult to pull off but I think the idea drifts into making sure you have the correct allocation to stocks, making sure you don't have more than you need. For example, a 55 year old who wants to retire at 68, has $1.8 million now, thinks his number is $2.5 million and is still adding to his savings. 

The median total return for rolling 13 year periods going back 100 years is 10.7% annualized, 274% total. This guy could have just 35% or $630,000 in equities and most likely come out ahead of what he thinks his number should be. Remember he is also still putting money in every year. I could see where 35% might be uncomfortably low but I don't think this situation needs 60% in equities either. 

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Explaining Your Strategy To A Child

Michael Sonnenfeldt from Tiger 21 wrote a guest essay for Barron's about whether or not to establish a family office. The main point ab...