Daniel wishes to sell his PlayStation video game console as he has no use for it any more. He advertises it for sale for $100. Hamish phones and says he will buy it at that price. Daniel says that he has changed his mind about selling, but thinks that he will charge $120 for it if he decides to sell. Hamish then offers $110, but Daniel says he needs to think about it.

At the football the next day, Daniel offers Paul the Playstation for $115. When Paul says no, Daniel says he will keep the offer open to Paul for 7 days in exchange for a lift to the football next week. Paul agrees to this.

A day later, Daniel is suddenly in need of money and phones Hamish, saying that he accepts the offer of $110. Hamish says that he has changed his mind and doesn't want to buy the Playstation any more.

Analyse each of these communications, and advise of the contractual liabilities of Daniel, Hamish, and Paul. Refer to relevant legal cases to support your arguments.