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9. The Prince of Monaco, $1 billion

Prince Albert II of Monaco looks on during the French L1 football match
Prince Albert II of Monaco | Yann Coatsaliou/AFP/Getty Images

The late Princess Grace Kelly’s son, Prince Albert II, runs Monaco, but that didn’t stop him from investing wisely. Prince Albert II is worth $1 billion because he has shares in the Société des bains de mer de Monaco. The company manages Monte Carlo Casino and the Opéra de Monte-Carlo’s funds. We’d say that’s a really sound investment.

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