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In economics, the marginal cost is the change in the total cost that arises when the quantity produced is increased, i.e. the cost of producing additional quantity. [1] In some contexts, it refers to an increment of one unit of output, and in others it refers to the rate of change of total cost as output is increased by an infinitesimal amount.
When average cost is rising, marginal cost is greater than average cost. When average cost is neither rising nor falling (at a minimum or maximum), marginal cost equals average cost. Other special cases for average cost and marginal cost appear frequently: Constant marginal cost/high fixed costs: each additional unit of production is produced ...
The total cost curve, if non-linear, can represent increasing and diminishing marginal returns.. The short-run total cost (SRTC) and long-run total cost (LRTC) curves are increasing in the quantity of output produced because producing more output requires more labor usage in both the short and long runs, and because in the long run producing more output involves using more of the physical ...
In the long run a firm operates where marginal revenue equals long-run marginal costs, but only if it decides to remain in the industry. [30] Thus a perfectly competitive firm's long-run supply curve is the long-run marginal cost curve above the minimum point of the long-run average cost curve. [31]
The additional total cost of one additional unit of production is called marginal cost. The marginal cost can also be calculated by finding the derivative of total cost or variable cost. Either of these derivatives work because the total cost includes variable cost and fixed cost, but fixed cost is a constant with a derivative of 0.
or "marginal revenue" = "marginal cost". A firm with market power will set a price and production quantity such that marginal cost equals marginal revenue. A competitive firm's marginal revenue is the price it gets for its product, and so it will equate marginal cost to price.
Long-run total cost (LRTC) is the cost function that represents the total cost of production for all goods produced. Long-run average cost (LRAC) is the cost function that represents the average cost per unit of producing some good. Long-run marginal cost (LRMC) is the cost function that represents the cost of producing one more unit of some good.
We can use the value of the Lerner index to calculate the marginal cost (MC) of a firm as follows: 0.4 = (10 – MC) ÷ 10 ⇒ MC = 10 − 4 = 6. The missing values for industry B are found as follows: from the E d value of -2, we find that the Lerner index is 0.5. If the price is 30 and L is 0.5, then MC will be 15: