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Karwai Tang/WireImage via Getty Images; Jeffrey Greenberg/Universal Images Group via Getty Images
The Birkenstock brothers are worth $3.4 billion, even after the shoemaker's shares tanked at its IPO
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Shell Bay
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Paul Morigi/Getty Images for Fortune/Time Inc
VWPICS/Nano Calvo/Universal Images Group via Getty Images
Chesnot via Getty Images