Musnad Ahmad 1149:2

Wahb ibn Jarir narrated to us, my father narrated to us, I heard Yunus, from al-Hasan, from ‘Amr ibn Taghlib, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Indeed, among the signs of the Hour is that wealth will overflow and increase, the pen will appear, and trade will spread." ‘Amr said: A man would make a sale and say: "Until I consult the merchant of the tribe of so-and-so," and one would search in a great tribe for a scribe, and not find one.