Home Bias

Home bias leads you to overweight your local market. Discover whether your portfolio has it and how to correct it with global index funds in Index Balance.

Definition

Home bias is the tendency of investors to overweight stocks or funds from their own country or region in their portfolio, beyond what the market's actual global weighting would justify. A Spanish investor with 60% of their portfolio in Ibex 35 companies is displaying strong home bias, when Spain represents less than 1% of global stock market capitalisation.

For the index fund investor, home bias is a psychological trap with real consequences: it concentrates risk in a single economy, reduces diversification and may lead to worse risk-adjusted returns. The causes are emotional and cognitive: familiarity, a perception of lower risk, ease of access and preference for the known. Boglehead investors protect against this bias by investing in global funds such as the MSCI World or MSCI ACWI, which already include domestic exposure in its correct proportion.

Index Balance lets you see the real geographical distribution of your portfolio and detect whether you have a significant home bias. Try it free at indexbalance.com.

Practical example

A German investor has €30,000 split as follows: €15,000 in a DAX ETF, €10,000 in a European ETF and €5,000 in an MSCI World. Germany represents 50% of their portfolio, but only about 3% of the global market. If the German market underperforms for a decade — as happened with the Japanese Nikkei — their portfolio will suffer far more than a globally diversified one. Index Balance calculates this automatically every time you update your portfolio.