A portfolio can have many different assets and still rely on just a few hypotheses to work.
The image presents an important sequence to understand this problem: assets → exposures → risk factors → hypotheses.
Holding stocks, real estate, fixed income, currencies, or commodities represents nominal diversification. But each asset has direct and indirect exposures to certain factors. Interest rates, economic growth, commodities, exchange rates, and economic activity can affect multiple positions at the same time.
That’s where concentrated risk arises.
Imagine a portfolio made up of different assets, but whose performance depends mainly on four assumptions: a fall in interest rates, economic growth, currency stability, and the maintenance of global demand. If any of these premises changes, several positions can be affected at the same time.
That’s why analyzing a portfolio only by the number of assets can hide its true risk structure.
The most relevant question is not only:
“How many investments do I have?”
Yes:
“How many assumptions does my wealth depend on?”
This approach also helps identify indirect exposures. A company may depend on global growth; a property may depend on credit conditions; a stock may be sensitive to interest rates; a currency may respond to international capital flows.
In the end, different assets can be connected by the same economic variable.
A deeper analysis turns the portfolio into a map of relationships: which factors generate returns, which can cause losses, and how many positions would be affected by the same scenario.
Therefore, diversification is not just spreading capital across assets.
It is to reduce excessive dependence on a few assumptions.
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