Could this stock really have 200% upside? Warren Buffett is one of the greatest investors of all time but he's not stingy with his knowledge. On the contrary, he wants to be remembered as a teacher. And in 1988, he used his annual letter to shareholders of Berkshire Hathaway to educate investors on something called merger arbitrage. In short, merger arbitrage happens when a stock trades at a price that is lower than what another company has already agreed to pay in a takeover. The first question that Buffet ...