Those who watch David Attenborough's documentary "A Life on Our Planet", released in 2020, realize with deep sadness not only the beauty of nature, but also how quickly this beauty is disappearing. Attenborough conveys the following basic message throughout the documentary: The resilience of nature depends on the diversity within it. If you haven't watched it, I recommend you do. Scientists fighting to protect nature today reiterate this message: Biodiversity is an insurance not only for natural life, but also for humanity. So how much does this determination relate to our individual financial decisions and investment approach? In fact, much more, especially when we consider it together with Nassim Nicholas Taleb's book Antifragile...

According to Taleb, the world consists of three main systems: Fragile, durable and antifragile.
-Fragile systems collapse under stress.
-Resilient systems resist stress but do not develop.
-Antifragile systems feed on stress and become stronger.

Natural ecosystems are in this third group: They are antifragile. Thanks to their diversity, they do not collapse despite shocks such as fire, drought, or invasive species; on the contrary, they learn from these shocks, evolve, and develop. A well-designed investment portfolio can be antifragile in the same way. Diversity established between different sectors, asset classes, and geographic regions; prepares the investor's system to strengthen rather than collapse under stress. An example? Gold or foreign exchange gaining value against falling stocks in a crisis. The protective effect of defensive sectors such as food and energy against cyclical areas such as technology.

In nature, a single type of agriculture - that is, monoculture - carries great risk. The soil becomes vulnerable to disease and cannot resist climate change. In the economy, portfolios dependent on a single investment vehicle are similarly fragile. In Taleb's words, this structure becomes vulnerable to "Black Swan" events, i.e. rare but devastating effects. Interest rate shocks, war, regulatory changes, or large-scale corporate bankruptcies can wipe out such fragile portfolios.

Taleb’s definition of antifragility is not only about diversity, but also about the system having “options” within itself. In nature, the migration of birds and the adaptation of plants according to the seasons are the “options” that nature has.

- In a financial portfolio, this looks like this:
- Keeping cash reserves,
- Blending short-term and long-term assets,
- Keeping defensive positions next to risky assets.
- Including geographically different asset groups in the portfolio
- Not being tied to a single currency as a currency

Taleb calls this type of behavior a “barbell strategy”: At one end are safe, predictable instruments, and at the other end are high-risk but limited-loss investment options. Moderate risk is avoided, and either very safe or controlled risk is taken. Attenborough’s message about nature and Taleb’s concept of antifragility come together at one point: sustainability.

Those who are permanent in both nature and the economy are not those who resist change, but those who adapt to it. Antifragile stands the test of time. Like systems that have survived in nature for millions of years, a well-designed investment portfolio also withstands and thrives against long-term shocks. The rise of ESG investments is no coincidence in this sense: Systems that are sensitive to nature, social structure and governance are not only ethical, but also antifragile.

Let me end with the words of Sir David Attenborough: “Nature does not belong to us, we belong to nature.” and let’s complete it with Taleb’s voice: “Antifragile systems thrive on the destruction of the fragile.” If your portfolio is diverse like nature, it will not only survive; it will emerge stronger from shocks. Not only to overcome crises, but to learn from them and rebuild… Diversity becomes an ally in time. Investing in today’s economy should be based not just on numbers, but on intuitions about nature, fragility and structural balance. Because capital is ultimately like life itself: It lives if it is structured according to harmony, not shocks.