User:Peculiar Investor/Home country bias

Home country bias is the tendency for investors to focus their investments in their domestic markets. Even though there is general agreement on the importance of exposure to a variety of asset classes, there is less agreement on the role of foreign securities in a domestic portfolio. Financial theory suggests that investors should construct their asset class exposure in line with global-market capitalization. The home bias phenomenon occurs all over the world, and is often intentional.

Although Vanguard has published research supporting international investing, it should also be noted that Jack Bogle doesn't recommend international investing.