Vanguard's re-energized International Explorer Fund has a new minimum initial investment amount - $25,000. The increase from the previous $10,000 initial amount was part of "an effort to curtail substantial cash inflows," the company said.

"We have raised investment minimums of other Vanguard funds in the past, and it has proven to be a successful method for stemming cash inflows and protecting the interests of long-term shareholders," Vanguard Chairman John J. Brennan said.

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