Seema places an advert in her local shop window, 'Five goblets for sale: each 10. Available only to the first five people "who pay me" this amount by Saturday 1st May'.

Ali sends Seema 10 in the post on Tuesday 27th April and says he will collect one goblet on Monday 3rd May. The letter gets lost in the post.

In the morning of Thursday 29th April Chet telephones Seema and asks if he can buy two goblets for 15. Seema says she needs time to think about this and Chet tells her to let him know by Saturday at 10am. On Thursday evening Seema calls Chet and leaves a message on his answering machine saying, 'I agree you can have two goblets for 15.' Chet does not hear the message until Saturday morning.

Being disappointed by the response to the advert, Seema decides to place the remaining three goblets in an auction on Friday 30th April. Seema places a note in her window stating that the goblets are no longer for sale and that they are going to auction.

Chet attends the auction and is delighted to see the goblets for sale. He makes a successful bid and buys the three for 15. He sees Eduord, Seema's partner, at the auction and says 'What a bargain I've got! I'm glad that Seema didn't respond to my telephone call'. Eduord calls Seema immediately. She is furious as she was keeping two goblets for Chet. In anger she takes two goblets to a charity shop on Friday evening.

Having seen the advert Diego arrives at Seema's house on Saturday morning with 10 and is very annoyed to see the note as he planned to give a goblet to his mother as a present. Ali arrives on Monday to collect his goblet.

Advise Seema.