Diversification for Australian Investors: Spreading Risk Effectively

Australia represents only about 2% of global share markets by capitalisation, yet many Australian investors hold 50-80% of their portfolio in ASX shares — a phenomenon known as home bias. The ASX is heavily concentrated in financials (banks) and mining, meaning a downturn in either sector disproportionately impacts a locally-focused portfolio.

True diversification for Australians means spreading across asset class (shares, bonds, property, cash), geography (ASX, US, Europe, Asia, emerging markets), sector (not just banks and miners), and company size. A single ETF like VGS (Vanguard MSCI International) provides exposure to over 1,500 companies across 23 developed markets outside Australia.

A popular diversified approach is the classic two- or three-ETF portfolio: VAS (Australian shares) for franking credits and local exposure, VGS (international shares) for global diversification, and optionally VAF (Australian bonds) for stability. This gives broad exposure with minimal complexity.

Owning shares in CBA, ANZ, NAB, and Westpac is not diversification — these are four companies in the same sector that tend to move together. Meaningful diversification requires low correlation between holdings, not just variety within banking.

Super funds handle diversification through their investment options. A typical balanced or growth option holds Australian shares, international shares, property, infrastructure, bonds, and cash. Checking your super fund's actual asset allocation is a good first step toward understanding your total diversification.