The Investment Masterclass · Lesson 8 of 19
Lesson 8 of the Investment Masterclass: why a good portfolio works like a football team, and the one word that makes diversification actually work: correlation.
Last verified: July 2026
Key takeaways
- A portfolio is simply the collection of assets you hold: cash, your home, stocks, and the rest, together.
- A portfolio works like a football team: performance comes from how the players play together, not from the sum of individual skills.
- Diversification only works through correlation: you want assets that are not correlated, or negatively correlated, with each other.
- The goal is a collection that performs well under many different circumstances, not one that only wins in sunshine.
Now that the biggest traps are behind us, from the squirrel mindset to the primal brain, it is time to think about what actually belongs in your portfolio. A portfolio is simply the collection of the assets you hold. Some cash, your house, some stocks: all of that together is your portfolio. And building one means thinking in terms of diversification: creating a collection of assets that, together, will perform well under many different circumstances.
Why is a portfolio like a football team?
Putting together a portfolio is like a coach putting together a team of eleven. The performance of the team is not the sum of each player’s individual skill; it is the sum of how they perform when they play together. A team is composed of roles: strikers, defenders, midfielders, a goalkeeper. The striker is not more or less important than the defender or the goalkeeper. Each player has a role, and together they form a team.
A portfolio built only of strikers looks spectacular until the other side attacks. Some assets are there to score, some to defend, some to hold the middle. Judging each asset in isolation misses the point: the question is what role it plays in the whole.
What does correlation mean in investing?
The mechanism that makes the team work is correlation: how assets move relative to each other.
| Relationship | What it means | What it does to your portfolio |
|---|---|---|
| Correlated | If A goes down, B goes down too | Doubles the pain, adds little protection |
| Not correlated | If A goes down, nothing happens to B | Cushions the blow |
| Negatively correlated | If A goes down, B goes up | The shock absorber |
You achieve real diversification by holding assets that are either not correlated or negatively correlated with each other. Ten assets that all fall together are one bet wearing ten jerseys.
How do the pieces fit together?
So portfolio thinking means asking, for every asset: what happens to the rest of the team when this one has a bad day? A favourable balance between risk and return comes from the mix, not from any single hero. That is how the squirrel’s instinct from Lesson 5 becomes an actual construction principle. The full curriculum lives on the masterclass hub.
Frequently asked questions
What is an investment portfolio?
Simply the collection of assets you hold: cash, property, stocks, bonds and the rest, considered together. Building one means choosing assets that perform well as a group under many circumstances, not just individually in good times.
What does correlation mean in investing?
How assets move relative to each other. Correlated: A falls and B falls too. Not correlated: A falls and B is unaffected. Negatively correlated: A falls and B rises. Diversification works through low or negative correlation.
Why not just buy the best-performing asset?
Because a team of only strikers loses the moment the game turns. The best performer in sunshine is often the worst in a storm; a portfolio needs defenders and a goalkeeper too.
How many assets does a diversified portfolio need?
There is no magic number. What matters is that the assets play different roles and do not all move together. A handful of genuinely uncorrelated assets diversifies better than dozens that rise and fall as one.
Next lesson: the three pieces of wealth management, and how investing fits into the rest of your life. And if you want a team built professionally around your goals, Alpian’s wealth advisory starts at CHF 2’000 at a FINMA-licensed Swiss bank.
This is Lesson 8 of 19
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