Warren Buffett plans to retire this year after delivering a return of over 5,000,000% to long-term investors through his holding company Berkshire Hathaway. With a market capitalization of $1.12 trillion, Berkshire is already quite large, so investors shouldn't expect a repeat of the previous six decades of growth.That said, the portfolio is still a great way to look for inspiration in the market. Let's discuss why two Berkshire-backed stocks, Amazon (AMZN 0.55%) and BYD (OTC: BYDD.F), could make great buys ...