marginal
marginalThe effect per unit of a small change in any variable. Marginal cost is the addition to total cost from a small increase in output, per unit of the increase. Marginal revenue is the effect on total revenue of a small increase in sales, per unit of the increase, allowing for any effect of quantity sold on price. The marginal social cost of any activity is the effect of a small increase in the activity on total social costs, per unit of the increase, including any externalities as well as direct costs to the producer. Similarly, marginal social benefit is the effect on total social benefit of a small increase in an activity, per unit of the increase, including externalities as well as direct benefits to the producer and purchaser. Marginal land, or land on the margin of cultivation, is land which would just become worth farming if output prices rose slightly, or would go out of cultivation if prices fell slightly. A marginal...
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