Yacob's concept of universal reason—truths accessible to all thinking beings—questions whether complex interest mechanisms and hidden fees can be justified as universally reasonable.
Zera Yacob argued that true reason is universal—accessible to all humans regardless of background, and therefore any ethical practice must be explicable and defensible to anyone who thinks carefully. Applied to banking interest, this challenges the assumption that compound interest, variable rates, and complex financial products represent universal rationality. If an average person cannot understand why they're charged a particular rate, or how interest accrues, the system fails Yacob's test of universal reasonableness. Banks justify complex structures as mathematically sophisticated, but sophistication that serves obscuration rather than clarity violates universal reason. Yacob would ask: Can this system be explained plainly to all people? Would all reasonable beings agree to these terms knowing fully how they work? Banking that depends on customers not understanding its mechanics betrays the principle of universal reason that Yacob championed as foundational to ethics.
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