Why group assets together?
Different types of investments behave differently under the same economic conditions. When interest rates rise sharply, bonds typically fall in price, but banks may become more profitable. When a recession hits, equities suffer but government bonds often rise as investors seek safety. Owning multiple asset classes reduces the risk that any one economic scenario destroys your entire portfolio.
The five main asset classes
| Asset class | What it is | Return/risk profile |
|---|---|---|
| Equities | Shares in companies | High return, high risk |
| Bonds | Loans to governments/companies | Medium return, lower risk |
| Real estate | Property (direct or REITs) | Medium-high return, illiquid |
| Commodities | Gold, oil, agricultural goods | Inflation hedge, volatile |
| Cash | Savings, money market funds | Low return, capital preservation |
Correlation: the key concept
The benefit of diversifying across asset classes comes from correlation — how closely two assets move together. Correlation runs from −1 (perfectly opposite) to +1 (perfectly in sync). Equities and high-quality government bonds have historically had a low or even negative correlation, meaning they don't tend to fall at the same time. This is why a "60/40" portfolio has been a financial planning staple for decades.
Alternative asset classes
Beyond the main five, institutional investors allocate to alternatives: private equity, hedge funds, infrastructure, private credit, and digital assets. These are less liquid but offer returns uncorrelated with public markets. Most private investors access them indirectly through multi-asset funds or listed REITs.
What this means for you
Even a simple portfolio of a global equity index fund and a government bond fund gives you two asset classes that historically offset each other's worst moments. The goal is not to own everything — it's to own enough different things that no single economic catastrophe wrecks you completely. Start simple; add complexity only when it serves a clear purpose.