Sometimes Berkshire Hathaway stock seems quite overvalued. This is not one of those times. When you survey the thousands of companies in the stock market, looking for an investment that might build your wealth over the long term, give some consideration to Warren Buffett's company, Berkshire Hathaway (BRK.A -1.27%) (BRK.B 0.18%). It has an amazing track record, as Buffett, in concert with his late business partner Charlie Munger, increased the value of the company by 5,500,000% (nearly 20% annually) over 60 ...