Breaking the concentration trap: Understanding the comfort of familiar assets and the cost of hidden risks

All investors build their portfolios with the best intentions. They choose assets that have served them well, that feel reliable, or that others around them have long trusted. Over time, this can create portfolios anchored in familiarity – Australian property, blue-chip equities or other well-known investments. On the surface, this feels like sensible, time-honoured diversification. Yet beneath the surface, many of these exposures are tied to the same underlying economic forces. What appears varied by label often moves together in practice, especially when markets become stressed.

This dynamic is not unusual. For families seeking to grow and preserve wealth across generations, familiarity offers psychological comfort. Owning property feels tangible and safe. Holding shares in leading companies provides a sense of participation in long-term economic growth. These instincts are rational and understandable. But they can also mask a deeper issue: concentration. When too many exposures depend on similar market conditions, portfolios become vulnerable to the same shocks, regardless of how diversified they look on paper.

The psychology behind concentration

Periods of calm rarely reveal this risk. It is only during global shocks – whether financial crises, liquidity squeezes or sudden market dislocations – that correlations rise and the illusion of diversification benefits fade. Research into long‑term equity behaviour has consistently shown that during periods of severe stress, markets that normally behave independently move in greater unison. Assets that once acted as diversifiers suddenly lose that characteristic, leaving investors exposed at the exact moment they expect protection. The lesson is clear: diversification based purely on long‑term averages can break down precisely when it is needed most.

Behavioural finance gives additional insight into why concentration risks persist. Investors, like all humans, are influenced by cognitive biases. Familiarity bias, in particular, plays a powerful role. People gravitate toward what they know, even when other opportunities may offer better diversification or more attractive risk-adjusted outcomes. Recent academic work examining investor behaviour has found that these biases meaningfully shape long-term returns. Familiarity, action bias and concentration-driven decisions account for a significant share of the variation in investor outcomes. In other words, investor psychology is not just an abstract concept – it is measurable, repeatable and highly influential.

Interestingly, institutional investors faced up to this challenge decades ago. With long‑dated obligations and strict performance requirements, they could not afford portfolios that behaved the same way in every market environment. They were forced to rethink diversification not as a matter of owning many assets, but of owning assets that behaved differently. This led them toward strategies that were unfamiliar at the time – private credit, alternative income, infrastructure and other exposures designed to provide resilience rather than familiarity. Their experience highlights an important lesson for individual investors: genuine through-the-cycle diversification often requires stepping beyond the comfortable and embracing assets that introduce new return drivers instead of repeating old ones.

The role of property-backed income and private credit

One such area is property‑backed income and private credit. These strategies differ meaningfully from traditional public markets. Rather than relying on daily price movements, they are driven primarily by asset cash flows and contractual interest payments. They are typically negotiated bilaterally, structured with clear protections, and held to maturity rather than traded. As a result, their behaviour is less tied to equity sentiment or public‑market volatility. For investors, this means they play a complementary role – providing income that does not depend on (or get upended by) the same economic levers as property or shares. Used appropriately and in the right size, they can help distribute risk more evenly across market cycles.

Of course, not all private credit strategies are the same. Some prioritise capital preservation through senior positions and high-quality borrowers; others take on more leverage or subordinated exposure, which can cause their behaviour to resemble equities during periods of stress. Understanding this spectrum is key. Diversification occurs when new exposures genuinely differ from existing ones – not when they simply repackage the same risks in a different structure.

The comfort trap: Why control feels safe

For many investors, the challenge is not recognising the benefits of diversification – it is overcoming the desire for what passes as control. Familiar assets feel transparent. Investors know what a property looks like, how long they have held certain shares or how a particular sector has behaved in the past. Introducing something new can feel like relinquishing that comfort. Yet, paradoxically, holding only what feels controllable can increase reliance on a narrow, and sometimes negative, set of outcomes. Sometimes reducing risk means accepting a broader set of exposures, even if they feel less familiar at first.

Reframing diversification can help bridge this gap. Instead of asking, ‘What assets do I own?’, a more powerful question is, ‘How do the assets I own behave when markets tighten?’ Two investments with different labels can rely on the same underlying drivers. Conversely, an unfamiliar strategy may bring genuine independence and stability. When investors look through this behavioural lens – focusing on how income is generated, how liquidity behaves and where risk truly sits – the case for introducing differentiated exposures becomes clearer.

Evolving, not replacing: Building more resilient portfolios

Ultimately, investors do not need to abandon the assets that may have served them well. Property and equities will continue to play important roles in most portfolios. But broadening the definition of diversification – from labels to behaviour – can help ensure portfolios are more balanced, more resilient and better positioned to support long-term goals. This shift strengthens today’s income needs while building the foundations for future generations. It is not about sweeping change. It is about thoughtful evolution – stepping slightly beyond the familiar to build something stronger, more stable and better prepared for whatever market environment comes next.