There are two basic power structures, says Bridgewater Associates co-CIO Bob Prince: democracy, with one equal vote per person, and dictatorship, where all decisions come from the top. At Bridgewater, the world's largest hedge fund, there's a third option. The fund calls it "believability-weighted decision making," and assigns certain votes more pull than others. It's "probably the optimal way to do it," Prince told Business Insider.