Why did the Prophet Muhammad (saw) forbid the meeting of caravans and prohibit a townsman from selling things on behalf of a bedouin?
 Narrated Tawus:                     Ibn `Abbas said, "The Prophet forbade the meeting of caravans (on the way) and ordained that no townsman is permitted to sell things on behalf of a bedouin." I asked Ibn `Abbas, "What is the meaning of his saying, 'No townsman is permitted to sell things on behalf of a bedouin.' " He replied, "He should not work as a broker for him."