Despite its ups and downs, the stock market remains one of the easiest ways to become a millionaire. How one uses the market to grow his or her wealth varies widely, however. Between exchange-traded funds, hedge funds, index funds, and all of the individual stocks across the world’s exchanges, it can get confusing. Now, let’s say you want a custom approach and hand-pick your portfolio of stocks in the pursuit of millionaire status. What should your criteria be for investing in the companies that will one da ...