Marginal cost

Marginal cost is a fundamental concept in economics and refers to the additional cost incurred by a company or producer when producing one additional unit of a product or service. In other words, it measures the increase in total cost resulting from a small change in the quantity of output produced.




The calculation of marginal cost involves taking the change in total cost (ΔTC) and dividing it by the change in the quantity produced (ΔQ):

Marginal Cost (MC) = ΔTC / ΔQ

It’s important to note that the concept of marginal cost is applicable mainly in the short run, as in the long run, the factors of production can change, and the cost structure may vary significantly.

The key characteristics of marginal cost are as follows:

Diminishing Marginal Returns: Marginal cost tends to decrease initially due to economies of scale and increasing efficiency as production increases. However, it may eventually start to increase due to diminishing marginal returns, where each additional unit of output requires more resources and becomes less efficient to produce.




Interpretation: Marginal cost represents the incremental cost of producing an additional unit of output. It helps companies make decisions on how much to produce and at what price to sell their products to maximize profits.

Decision Making: Rational decision-making suggests that a company should continue to produce additional units as long as the marginal cost is less than or equal to the marginal revenue (the additional revenue generated from selling one more unit). This helps in determining the optimal level of production and pricing strategy.

Short-Term Pricing Decisions: Marginal cost is also used to set short-term prices, especially in competitive markets. Pricing products at or near their marginal cost can help a company maximize sales and market share in the short run.




Understanding marginal cost is crucial for businesses to optimize their production and pricing strategies. By analyzing how costs change with changes in production levels, companies can make informed decisions about resource allocation, production levels, and pricing, leading to improved efficiency and profitability.

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