The slope of the Production Possibility Frontier (PPF), measuring the units of Good Y sacrificed to produce an extra unit of Good X, is named as:

Options:

• A: Marginal Rate of Transformation (MRT)
• B: Marginal Rate of Substitution (MRS)
• C: Marginal Propensity to Consume (MPC)
• D: Marginal Rate of Technical Substitution

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