All three examples reduce the financier's ownership to zero, but their mechanics differ. A house combines ownership and leasing (إجارة); a taxi combines ownership and service income; a trading business combines partnership profit rules with gradual sale of business units. These applications must therefore be analyzed separately.
Rent is justified by use of an owned share, so it should track the ownership that actually remains with the lessor. If ownership falls, the rentable share also falls.
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Diminishing Partnership (المشاركة المتناقصة): The Core Idea
All three examples reduce the financier's ownership to zero, but their mechanics differ. A house combines ownership and leasing (إجارة); a taxi combines ownership and service income; a trading business combines partnership profit rules with gradual sale of business units. These applications must therefore be analyzed separately.
Rent is justified by use of an owned share, so it should track the ownership that actually remains with the lessor. If ownership falls, the rentable share also falls.