Without the consumer the world would probably be overpopulated with something.
Ex: Spiders eat flies. If there were no spiders there would be too many flies.
Hope this helps.
I assume "Muslim belief system" refers to Islam, the religion, not any specific social construct. There are a lot of inherent elements. One is monotheism: there is only 1 god. Another element is the 5 Pillars of Islam, which give guidance on how to live one's life. Hope this helps.
