二、生产弹性与生产投入三阶段的划分 Definition Implicit costs Costs that do not involve a direct payment of money to a third party, but which nevertheless involve a sacrifice of some alternative Historic costs The original amount the firm paid for factors it now owns Replacement costs what the firm would have to pay to replace factors it currently owns. Fixed costs Total costs that do not vary with the amount of output produced Variable costs Total costs that do vary with the amount of output produced.二、生产弹性与生产投入三阶段的划分 Definition Implicit costs Costs that do not involve a direct payment of money to a third party, but which nevertheless involve a sacrifice of some alternative. Historic costs The original amount the firm paid for factors it now owns. Replacement costs What the firm would have to pay to replace factors it currently owns. Fixed costs Total costs that do not vary with the amount of output produced. Variable costs Total costs that do vary with the amount of output produced