Bob: '__. __... Al: I will sell you my car for $500. Bob: No, I don't want it for $500. Bob: But I'll give you $400 for it. Al: No way, you cheap bum! Al: I will sell you my car for $500. Bob: I'll give you $400 for it. Al: 0k, it's a deal! Al: I will sell you my car for $500. Bob: I'll give you $400 for it. Al: Make it $450. Bob: 0k. it's a deal! Al: I will sell you my car for $500. Bob: No, I don't want it for $500. Bob: But I'll give you $400 for it. Al: No way, you cheap bum! Bob: 0k. OK, I'll take it for $500