# What is Marginal Cost and Marginal Cost Equation

## What is Marginal Cost

The marginal cost of an additional unit of output is often referred to as the “prime cost plus variable overhead.” It encompasses all costs that vary according to the amount of output.

To determine the marginal cost, a comparison between the cost of manufacturing one unit and the cost of creating the next one must be made.

## Significance of Marginal Costing

Marginal costing has been a critical component of traditional management accounting since its inception. However, as management accounting evolved over the last decade, the form and breadth of marginal costing shifted dramatically. Its ideas have been updated to reflect modern management accounting concepts.

Due to their limited application and rising complexity, experts now challenge conventional cost accounting techniques. Cost management techniques such as investment assessments and value-based tools are required in addition to the traditional function of cost accounting in monitoring the economic production process and cost assignment for internal activities. The former are generally condemned for their usefulness in the modern world, but the latter are blamed for their apparent pseudo-accuracy, which does not assist management in accomplishing its objectives.

Numerous authors, on the other hand, maintain that traditional cost accounting has not lost any of its value since the data structure or fundamental architecture necessary for current tools and methodologies is already available in the pre-existing conventional body of knowledge. To ensure that the notion of marginal costing remains relevant in today’s business environment, it is necessary to address the following postulates regarding the term’s shifting significance:

## Marginal Cost Equation

The analysis of marginal cost statement and the contribution mentioned above reveals that:

(i) Sales — Marginal cost = Contribution (I)

(ii) Fixed cost + Profit = Contribution (ii)

By combining the above two equations, we get a fundamental marginal cost equation:

Sales — Marginal Cost = Fixed Cost ± Profit/Loss

or S—V=F±P/L

The marginal cost equation is important to the extent that if the values of any three of the preceding equation’s parts are known, the fourth element may be simply estimated.