Friday evening after closing ABC Furniture Store, hereinafter referred to as "Seller" placed an advertisement in its window:

"This weekend only, five handmade Italian sofas, reduced from $2,000.00. Drop to $799.00! Shop Early!"

Mrs. Anna Smith hereinafter referred to as "Purchaser" saw the advertisement later that evening. The Purchaser appeared the next morning at 9 a.m. just when the Seller opened its doors and stated to the clerk that the Purchaser would take one of the Italian sofas. The Seller replied that the advertisement was a mistake; the price should have been $1,500.00. The Purchaser demanded to speak with the manager of the Seller. The manager said the following:

"I am sorry, madam, but the sofa cost us more than $799.00. We cannot sell it at $799.00."

The Purchaser said that she would consult with its legal counsel.

Could she enforce ABC Furniture Store to sell her the sofa for $799.00 or $1,500.00? What advice would you give to Mrs. Anna Smith? Please explain your answer in detail.