Despite a 36% overvalued stock market Warren Buffett recently bought more than $2.3 billion worth of this high-yield blue-chip. There are three reasons that both I and Buffett love this fast-growing company, which analysts think could deliver 5X the returns of the broader market in the coming years. Basically, this Buffett blue-chip bargain might be just what your portfolio needs to help you achieve the rich retirement of your dreams.