What is the backbone of the economic system of Islam?

What is the backbone of the economic system of Islam?

معاشی نظام اسلام کی ریڑھ کی ہڈی کیا ہے؟
Explanation

If you have 7.5 tola/3 ounces/87.48 grams of gold or

52.5 tota/21 ounces/612.36 grams of silver or

its cash equivalent for a full lunar year,

then you are considered Sahib-e-Nisab and should pay Zakat 2.5%

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VU FIA UDC CONSTABLE PAST PAPER 31-12-2021