Discuss the following statements:

(a) ‘Once you consent to some concession, you can never cancel it and put things back the way they were’

(b) ‘We cannot negotiate with those who say “What’s mine is mine, what’s yours is negotiable”

’ (John F. Kennedy)

(c) ‘Flattery is the infantry of negotiation’ (Lord Chandos)

(d) ‘Always define your terms’ (Eric Partridge).