Home Country Bias
Why the natural preference for domestic investments varies dramatically in cost depending on where you live, and why currency risk concerns are often overblown.
Home country bias is the natural preference for the familiar — investing disproportionately in companies from your home market. Every investor exhibits it to some degree. The critical question is how much it costs you, and that depends entirely on where home is.
The Severity Depends on Where You Live
- A US investor overweighting US stocks holds ~60% of global market cap anyway. The structural cost of home bias is limited because the domestic market is already the world's largest.
- A Singapore investor restricting to domestic stocks limits themselves to ~1% of global market cap. They are voluntarily excluding 99% of the opportunity set.
The STI represents a tiny slice of what is available globally. Restricting to it is bad for diversification and bad for long-term outcomes. A Singapore investor with 100% domestic allocation has made an extreme concentration bet, whether they intended to or not.
Home country bias is not equally harmful everywhere. For small-market investors, the cost is dramatically higher. A Singaporean who only owns Singapore stocks has made a far more consequential decision than an American who only owns US stocks — even though both are exhibiting the same behavioural bias.
Currency Risk: USD/SGD
For Singapore-based investors in global (USD-denominated) equities, currency risk is a common concern. The worry is overblown.
Expected SGD appreciation against USD is approximately 2-3% per annum, driven by interest rate differentials between the two currencies. This is a known, priced-in feature of the exchange rate — not a surprise risk.
Occasional years of sharper USD weakness against SGD should not be extrapolated into a permanent trend. Currency fluctuations are noisy in the short term. Over long holding periods, the equity risk premium dwarfs the expected currency drag. Do not let a 2-3% annual headwind prevent you from accessing the other 99% of the global market.
The Solution
A global index fund like VWRA gives proportional exposure to markets worldwide, automatically reflecting each country's share of global market capitalisation. It is the simplest correction for home country bias — you do not need to research foreign markets individually.
Related
- Single-Country Risk — The broader case for why any single-country concentration should be a deliberate, justified choice.
- Index Investing — How a single global ETF eliminates home country bias by construction.
- Market-Cap Weighting — Why proportional allocation across markets reflects collective market intelligence.