In its 2004 Annual Report, Hershey Foods indicated the Wal-Mart accounted for 22% of its total sales in the year 2003. Wal-Mart was responsible for 16% of Proctor & Gamble's (P&G) 2004 revenues. It is very likely that similar percentages can be found for many of Wal-Mart's leading suppliers. Many of these companies have well-staffed offices in Bentonville, Arkansas, where Wal-Mart's corporate headquarters is located. There are "specific investments" made by these companies to serve one customer, Wal-Mart. Diversification logic would suggest that these firms should vertically integrate into retailing (forward integration) to reduce the possibility of losses due to Wal-Mart's opportunistic behavior. Please discuss if it makes sense for firms like Hershey and P&G to vertically integrate into retailing. Use resource and capability logic in your response