More is not always better
Without a plan, investors often build their portfolios from the bottom-up, focusing on each investment holding rather than the portfolio as a whole, and often lacking the diversification needed to adequately mitigate market risks.
Diversification is not necessarily about owning more securities, but rather the right mix of securities.
Investing in several bank shares instead of just one may help mitigate single security risk but concentration risk remains high given the single industry focus.
Similarly, investing solely in ASX-listed companies increases diversification across sectors but remains concentrated in the local market.
Conversely, investing in a broad-based Australian shares ETF such as the Vanguard Australian Shares Index ETF (VAS) alongside another ETF that provides broad international exposure such as the Vanguard MSCI Index International Shares ETF (VGS) is an example of how investors can diversify not only within markets but also across regions.
Remember, markets will often behave differently from each other—sometimes marginally, sometimes greatly—at any given time. Owning a diversified portfolio with exposure to different markets allows the investor to participate in stronger performing areas while also mitigating the impact of weaker areas.