Target date funds might want to branch out into more international fare if they want to remain competitive, writes Jonathan Burton in today's WSJ Fund Track column. International funds are seen as having some of the highest long-term growth potential. However, most fund shops that have target date funds only invest around 20 to 30 percent of their holdings in stock outside the U.S. Michele Gambera, chief economist at Ibbotson Associates/Morningstar, says that a safe percentage of holdings for target dates to have in international stock is about 30 percent. 

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