Montbanks’s son, Charles, was seeking an account executive position with Dobbs, Smith & Fogarty, Inc., a large brokerage firm. Charles was independent and wished no interference by his well-known father. The firm, after several weeks’ deliberation, decided to hire Charles. They made him an offer on April 12, 2010, and Charles accepted. Mont banks, unaware that his son had been hired and concerned that he might not be, mailed a letter to Dobbs on April 13 in which he promised to give the brokerage firm $150,000 in commission business if the firm would hire his son. The letter was received by Dobbs, and the firm wishes to enforce it against Mont banks. May Dobbs enforce the promise? Why?