Leasing (إجارة): Sub-Lease, Assignment and Ijarah Certificates

Read-only question overview. Answers and scoring remain inside authenticated learner attempts.

• When may a lessee sub-lease an asset whose use may vary between users?
• All jurists agree that a sub-lessor may always keep any surplus above the original rent.
• What happens when the leased asset itself is sold to a new owner?
• What does a genuine Ijarah certificate represent?
• A certificate representing only already-due rent is the same as one representing ownership in the leased asset.
• Why can genuine Ijarah certificates help liquidity management?
• What is the main problem with the criticized head-lease structure?