On November 1, Debbit, an accountant, and Barrister, a lawyer, contracted for the sale by Debbit to Barrister of the law books Debbit had inherited from his father. Barrister agreed to pay the purchase price of $10,000 when Debbit delivered the books on December 1. On November 10, Barrister received a signed letter from Debbit that stated: "I have decided to dispose of the book stacks containing the law books you have already purchased. If you want the stacks, I will deliver them to you along with the books on December 1 at no additional cost to you. Let me know before November 15 whether you want them. I will not sell them to anyone else before then." On November 14, Barrister faxed and Debbit received November 14, Barrister faxed and Debbit received the following message: "I accept your offer of the stacks." Debbit was not a merchant with respect to either law books or book stacks. Debbit is contractually obligated to deliver the stacks because 
Barrister provided a new bargained-for exchange by agreeing to take the stacks. Debbit's letter (received by Barrister on November 10) and Barrister's faxmessage of November 14 constituted an effective modification of the original sale-of-books contract. Barrister's fax-message of November 14 operated to rescind unilaterally the original sale-of-books contract. Debbit's letter (received by Barrister on November 10) waived the bargained-for consideration that would otherwise be required.