Robin inherits 1,000 shares of Wal-Mart stock from her aunt in 2015. According to the information received from the executor of her aunt's estate, Robin's adjusted basis for the stock is $55,000. Albert, Robin's fiancé, receives 1,000 shares of Wal-Mart stock from his uncle as a gift in 2015. His uncle tells Albert that his adjusted basis for the Wal-Mart stock is $7,000. What could cause the substantial difference in the adjusted basis for Robin's and Albert's respective 1,000 shares of Wal-Mart stock?