Act as a speculative fiction writer with expertise in dystopian worldbuilding. Craft a detailed society where human body parts are the primary medium of exchange. Describe the [ECONOMIC SYSTEM] that governs trades, the [SOCIAL HIERARCHY] based on bodily value (e.g., rare organs, limbs), and the [ETHICAL LAWS] that regulate or exploit this market. Include how scarcity, black markets, and medical advancements shape power dynamics. How do people justify or resist this system? Be vivid in portraying daily life, from bargaining with a finger to elites hoarding perfect eyes. Ensure logical consistency and emotional weight.