The document discusses the differences between trade and interest/riba, arguing that interest is prohibited in Islam. It summarizes four key differences: 1) Trade involves risk sharing while interest guarantees returns to the lender. 2) Trade promotes equality while interest concentrates wealth with the rich. 3) An interest-free system in Medina was able to fulfill all essential needs while rich countries with interest still have unmet needs. 4) Interest introduces instability through high volatility and short-term thinking, while equity-based risk sharing promotes long-term cooperation and stability. The document concludes by asking the reader if prohibition of interest still seems doubtful, or if interest-free systems provide