I'm not 100% sure but it could be: Voluntary Exchange takes place between buyers and sellers:
(btw I copied and pasted from the question so I didn't take any content :D)
I am a Muslim. the origin is Saudi Arabia, makkah. it started from prophet Muhammad's birth. the main beliefs r of monotheism, that there is onr God and Muhammed is his messenger. I can tell you soooooo much more, but I can't type it all. but these r the answer to your questions. (:
