The battle for emerging market growth is turning into a cutthroat competition between established multinational companies and a new generation of rivals.
The trouble, according to Joe Mariano, president of the Direct Selling Association, that "there are a lot of pyramid schemes that like to disguise themselves as legitimate direct-selling companies."
A CNBC reporter since 1990, Pisani reports on Wall Street and the stock market from the floor of the New York Stock Exchange. Follow him on Twitter @BobPisani.