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1. Efficiency is the most possible productivity gained from an operation, good, or service with the least amount of time, energy, or money used in transaction costs.
 
1. Efficiency is the most possible productivity gained from an operation, good, or service with the least amount of time, energy, or money used in transaction costs.
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2. A & B must be substitutes while B & C are complements.
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2. A & B must be substitutes while X & Y are complements.
    
3. The marginal cost for me to make one more unit would be $20
 
3. The marginal cost for me to make one more unit would be $20
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