1. **Stating the problem:** The question asks to discuss two major critiques of Marx's Labor Theory of Value (LTV) and how Marx or Marxist economists responded to them. It also asks which critique is most convincing and why. 2. **First critique - Subjective theory of value:** Critics argue that value is determined by subjective preferences and utility, not just labor input. This challenges Marx's idea that labor alone creates value. 3. **Marxist response:** Marxists argue that while utility affects price, the underlying value of commodities is determined by socially necessary labor time. Prices fluctuate around this value due to supply and demand but do not negate labor as the source of value. 4. **Second critique - Transformation problem:** Critics point out the difficulty in transforming labor values into market prices of production, which include profits and capital costs, suggesting inconsistency in Marx's theory. 5. **Marxist response:** Marxist economists have developed various solutions to the transformation problem, such as Okishio's theorem and temporal single-system interpretation, to reconcile labor values with prices and profits. 6. **Most convincing critique:** The subjective theory of value is often seen as more convincing because it aligns with observed market behavior where consumer preferences influence prices, which Marx's LTV does not fully account for. 7. **Summary:** Marx's LTV emphasizes labor as the source of value, but critiques highlight the roles of subjective utility and price formation complexities. Marxist responses attempt to defend and refine the theory. References: For detailed discussions, see "Capital" by Karl Marx (Penguin Classics, 1990, pp. 45-60) and "Value, Price and Profit" by Karl Marx (International Publishers, 1977, pp. 12-30).