a) I thought an advertisement was merely an invitation for an offer. Why did this advertisement create

Question:

a) I thought an advertisement was merely an invitation for an offer. Why did this advertisement create an offer?
b) The could have caught this serious typo by proofreading the ad before the paper printed it. Did the court take that into account?
c) What would be the result if the court adopted the plaintiff's argument and enforced this contract?
d) What's the moral?
Dealer
A dealer in the securities market is an individual or firm who stands ready and willing to buy a security for its own account (at its bid price) or sell from its own account (at its ask price). A dealer seeks to profit from the spread between the...