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What sports fans and stock-market investors have in common

By Stefan Van Geyt

Stefan Van Geyt
Stefan Van Geyt

Sports fans the world over (from Manchester to Munich to Mumbai) often form a profoundly intense attachment to their team. Very rarely, however, is that attachment founded upon rational deliberation, objective research or any kind of considered personal preference.

Instead, we simply root for the team based in the place we call home.

In fairness to such fans, nearly all of our core beliefs are similarly arbitrary. That includes, at least partly, when it comes to investing.

Individuals worldwide tend to invest disproportionality in stocks listed in their native country, a phenomenon known as “home bias.” Given the proven benefits of diversification and easy availability of global data flows, this makes little strategic sense.

Consider Canada. The country has a global index weight, or share of total world market capitalization, of about 3%. Yet Canadians hold roughly 60% of their equity investments in domestic shares.

Or take South Korea, which has a global index weight of less than 2%. Residents there nevertheless make 90% of their equity investments in the domestic market.

Even the United States, with a massive global index weight of nearly 40%, is guilty of home bias – with American investor holdings in domestic equities standing at approximately 80%.

Such bias is found, to a greater or lesser degree, in every single market worldwide. The trend is especially pronounced in emerging markets – where there are often structural barriers to overseas investment – and is least evident in Europe, especially since the introduction of the common currency and elimination of exchange-rate risk.

Between 1997-2004, the level of home bias in the eurozone declined by 9%. Over the same period, the level of regional bias (meaning total investment in eurozone shares) increased slightly.

Within Europe, the Dutch, who have long embraced an international equity investment strategy, are by far the least exposed to home bias, with slightly more than 20% of equity investments allocated to the domestic market. That sounds pretty balanced – until you consider that the Netherlands represents less than 1% of total world market capitalization.

Like the Netherlands, Austria, Belgium and Germany also at first appear relatively unbiased, with roughly 37%, 45% and 48% of their equity investments in domestic shares. Once again, though, this has to be put in context: Germany, the largest of the three markets, has a global index weight of barely 3%.

The trend is even more exaggerated in France, which has a global index weight of 3% and where residents there nevertheless make 60% of their equity investments in the domestic market.

While each of these countries compares favorably to the international mean, being better than average obviously remains far from ideal.

Over the past two decades, nine out of the ten best-performing stock markets have been in emerging markets, according to Bloomberg data. Yet relatively few investors have much exposure to Brazil, Kazakhstan or Peru (the world’s three best-performing markets in 2016).

Given the governance gaps and political risks in many emerging markets, it’s understandable that not everyone wants to buy Kazakh shares. But the broader issue of home bias remains a puzzle that has left economists scratching their heads for decades.

It may pain practitioners of the dismal science to admit it, but the value of geographic portfolio diversification is simply no match for human psychology.

That’s why we overweight our own market, despite all the evidence that says we should do otherwise. It is the same reason our spirits rise and fall with the fortunes of our home team –  even if, deep down, we know it’s just a game.


Mr.Van Geyt serves as Group Chief Investment Officer at KBL European Private Bankers, which operates in the UK under the name Brown Shipley. The statements and views expressed in this document are those of the author as of the date of this article and are subject to change. This article is also of a general nature and does not constitute legal, accounting, tax or investment advice.