Key Points Stocks have had quite a run in the past three years and become quite expensive relative to the economy. Investors should consider rebalancing their portfolios and looking for those diamonds in the rough. Most of all, it's essential to remain optimistic and continue investing through the market's ups and downs. These 10 stocks could mint the next wave of millionaires › Billionaire investor Warren Buffett is renowned for his discipline on stock valuations. He famously developed what has ...