Question: Goldman, Sachs, and Co.: Nikkei Put Warrants-1989 (Harvard Business School Case 292113-PDF-ENG). The case illustrates how investment banks can design, produce (hedge), and price put warrants on the Nikkei Stock Average. Nextel Partners: Put Option (Harvard Business School Case 207128-PDF-ENG). The case examines issues surrounding Nextel's shareholders' vote to exercise a put option that requires the company's largest shareholder, Sprint Nextel Corp., to purchase all the shares it does not already own. Pixonix Inc.-Addressing Currency Exposure (Richard Ivey School of Business Foundation Case 908N13-PDF-ENG. Harvard Business Publishing). The case discusses the impact of exchange rate fluctuations on a firm's cash flows and how derivatives can be used to manage this risk.