On 1 March, Ben, a science lecturer at a local university (NWK),sent a letter by post to Ian, a local astronomy expert, invitingIan to speak to Ben’s class. The letter said:
“I will pay you $1,000 to speak to my class on 1 June. Pleaserespond to me by 1 May if you accept.”
The next day, on 2 March, Ian became aware of a better speakingopportunity at a local business seminar tentatively scheduled for 1June. He immediately sent the following email to Ben:
“I would have enjoyed speaking to your class on 1 June. However,I’m likely to have another commitment on that day,
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