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The Fool replies: Until European brokers open up more to world markets, one of the best ways to buy shares in worldwide companies is through an American online broker.
Many of the world's biggest and best companies, even if they don't have a direct American listing, will have American Depositary Receipts (ADRs) listed, which is the same thing in effect. Many US brokers will accept foreign clients, and their charges are usually pretty low too. You will find them advertised on many financial websites.
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