On December 15, Lawyer received from Stationer, Inc., a retailer of office supplies, an offer consisting of its catalog and a signed letter stating, "We will supply you with as many of the items in the enclosed catalog as you order during the next calendar year. We assure you that this offer and the prices in the catalog will remain firm throughout the coming year." Assume that on January 15, having at that time received no reply from Lawyer, Stationer notified Lawyer that effective February 1, it was increasing the prices of certain specified items in its catalog. Is the price increase effective with respect to catalog orders Stationer receives from Lawyer during the month of February? 
No, because Stationer's original offer, including the price term, became irrevocable under the doctrine of promissory estoppel.  No, because Stationer is a merchant with respect to office supplies; and its original offer, including the price term, was irrevocable throughout the month of February.  Yes, because Stationer received no consideration to support its assurance that it would not increase prices.  Yes, because the period for which Stationer gave assurance that it would not raise prices was longer than three months.