 In some kinds of dialogue — in the exchanges that characterize negotiation, bargaining, eristic, and persuasion — acceptable premises may not need to be true. In bargaining (“haggling”) a buyer may claim that “I will not give you a penny more than $300 for that lamp” as a premise in support of the conclusion that the seller should agree to a lower price. This counts as an acceptable premise even if it is an idle threat that the buyer will never carry out, for threats of this sort are an acceptable element of the arguments that take place in this kind of dialogue. 