Marginal cost is an important indicator to help businesses production optimization. Controlling and reducing marginal costs will increase profits, improve performance and better compete in the market.
In this article, Bizzi will provide you with full information related to What is marginal cost? as well as how to optimize costs to maximize profits.
What is the definition and characteristics of marginal cost?
Define
Marginal Cost (MC) To be additional costs when producing one more unit of a product or service. This is the additional cost (∆C) to create a new unit of output (∆Q). Marginal cost helps businesses understand the variation in total cost when producing additional products and assisting in the cost management and production decision
Marginal cost characteristics
Measure only additional costs
- Marginal cost measurement additional cost (new cost level) when producing one more unit of product.
- Not including the fixed cost or Cost does not change (Constant marginal cost) in production
Helps businesses focus on additional costs
- Marginal cost support business focus on additional costs instead of the whole production costs in business, helps optimize production process and minimize waste.
Depends on production scale
Marginal cost changes when production scale change:
- Economies of Scale (Economies of scale): Marginal costs can decrease when increased output, thanks to efficient use of resources such as human resources and machinery.
- Diseconomies of Scale (Diseconomies of scale): When production exceeds the optimal level, marginal cost may increase by resource constraints (machinery, human resources, raw materials).
May change over time
- Short term: Marginal costs can fluctuate widely due to factors such as ingredient, labor, and machine productivity change over time
- Long term: Firms can reduce marginal costs through strategies technology investment, Optimize production process, and efficient resource management.
Marginal cost formula
To go deeper into the concept What is marginal cost?, here is the exact calculation formula:
– General formula: MC = ∆C / ∆Q.
- In there:
- MC: Marginal Cost.
- ∆C (Change in cost): The change in total cost is calculated by subtracting the total cost of production from the old output from the new output.
- ∆Q (Change in output): Change in total quantity of products,is calculated by new total output minus original total output.
– Note: This formula is only calculate additional cost per unit of product, not counting the total cost of the entire production.
For example:
- A lipstick factory has a total cost of 100 million VND for 1,000 lipsticks.
- If 100 more lipsticks are produced, the total cost increases to 105 million VND.
- Marginal cost = (105 million – 100 million) / (1,100 – 1,000) = 50,000 VND/lipstick.

Meaning and role of marginal cost
Marginal Cost (MC) plays an important role in many aspects of business, from production management, pricing, competitive strategy to operations. financial decision analysis.
Below are the important meanings and roles of MC in each area of the business:
– In business management:
- Helps optimize production levels, thereby maximizing profits.
- Support making correct and optimal management decisions for pricing and business strategies.
- Helps managers compare results during plan implementation.
- Plays a role in assessing the quantity of goods and services provided to consumers.
- Support revenue comparison and make decisions to cut ineffective activities.
– Compare with Marginal Revenue (MR):
- If MR > MC: Profit is likely to increase, so increase output.
- If MR ≤ MC: Need to improve revenue and cost management, even stop production because it may be losing money.
– In Production:
- Helps determine optimal output levels for maximum profit.
- Impact on price, support appropriate price adjustment and evaluate production line efficiency, minimize risks and avoid capital loss.
– In Marketing:
- Is the foundation for determining the next marketing steps.
- If the marginal cost of increasing advertising spending is less than the additional revenue, increasing advertising spending is rational.
- Helps determine optimal pricing to maximize revenue.
– In Finance:
- Help investors evaluate the feasibility of the project and the profits it brings.
- Help managers develop policies to minimize risks and avoid financial losses if costs get out of control.
Relationship between Marginal Cost and Average Cost
Average Cost (AC) is the cost per unit of output, calculated by dividing total cost by the number of products.
The relationship between Marginal Cost (MC) and Average Cost (AC) is one of the important principles in economics. microeconomics, especially in theory of production costsThis relationship can be described as follows:
- As output increases, if MC < AC then AC will decrease.
When marginal cost is less than average cost, each additional unit of output costs less than average, causing average cost to fall. This is the stage where the firm is taking advantage of economies of scale.
- As output increases, if MC > AC then AC will increase.

When marginal cost is greater than average cost, each additional unit of output costs more than the average, causing average cost to rise. This is the stage where diseconomies of scale appear.
- When MC = AC then AC is at minimum.
When MC = AC, average cost reaches its minimum. This is the point at which the firm is most cost efficient. At this point, if the firm produces less, average cost will still fall; if it produces more, average cost will begin to rise.
Marginal cost (MC) helps compare the results of implementing the plan, while average cost (AC) is used to evaluate the impact of changes in output on unit costs. This helps the business determine the optimal output level to minimize production costs.
The basic difference between these two types of costs is: MC is a cost increase per unit, AC is the cost on each unit.
Marginal cost curve
- For a typical business, it usually takes the form of an inverted parabola or a U-shape.
- Initially: MC value tends to decrease because costs (fixed + variable) per unit tend to decrease (economies of scale).
- Later stage: By mid-cycle, variable cost continuously increases, higher than the rate of decrease in fixed costs, causing MC to start to increase.
- Turnaround point: The point at which the increase in variable costs equals the decrease in fixed cost
- When output is low, MC can be high due to excess production capacity.
- As output increases to the optimal level, MC reaches a minimum value, then increases again if output exceeds the optimal level.

Notes when analyzing marginal costs
- Difficult to apply in some industries: Such as shipbuilding, airplanes, etc. with unfinished products having large value corresponding to revenue. Not counting fixed cost Including the ending value of work in progress can cause distortions.
- Don't ignore exogenous factors and hidden costs: Raw material costs can change according to the market, labor costs can fluctuate due to wage increases or government policies, opportunity costs (can create higher profits if resources are used for other purposes).
- Pay attention to economies of scale: As production expands, marginal costs can decrease due to economies of scale (reduce average cost). However, if it exceeds the optimal level, marginal costs may increase due to the phenomenon of economies of scale.
- Caution should be exercised when applying: Must be presented and explained reasonably, accurately, and in relation to all variables in the particular situation.
- Identify variable costs clearly: To calculate accurately, it is necessary to determine which components of the total cost have variations and the specific amount of variation.
- Distinguish and understand the nature of marginal cost and average cost
- Determine calculation time and external factors: Costs can change over the short and long term, influenced by markets, technology, and policies.
- Avoid confusion with average cost.
How to reduce marginal costs effectively
– Leveraging economies of scale
- When producing in large quantities, marginal costs tend to decrease due to better utilization of resources.
- Solution: Increase production when marginal cost is lower than selling price to maximize profit.
– Reduce raw material and production costs
- Negotiate with suppliers to buy raw materials in bulk at better prices.
- Improve production processes to save materials and time.
– Technology application & automation
- Apply machinery, ERP software to reduce labor costs and increase efficiency.
- Technology helps reduce errors, avoid waste and improve productivity.
– Optimize human resources and work processes
- Train employees to improve performance and reduce errors in production.
- Arrange work properly to avoid wasting labor.
– Good control of fixed and variable costs
- Reduce fixed costs by optimizing rental space and warehouses.
- Consider outsourcing some services instead of doing them yourself if it's cheaper.
- Find suppliers with reasonable prices
– Leverage data to forecast demand
- Use data analysis to produce exactly what the market needs, avoiding overproduction and waste.
Evaluate a business based on marginal cost
Marginal cost (MC) provides important information about the performance, competitiveness, and sustainability of a business in the long run. More specifically, the impact of What is marginal cost? Based on that, businesses will grasp the financial situation?
Below are the Impact of marginal cost on revenue:
– Production efficiency
- If MC decreases as output increases → The firm is taking advantage of economies of scale, more efficient production.
- If MC increases rapidly when expanding production → The business may encounter economies of scale or the cost of raw materials and labor increased sharply.
– What are the pricing and profitability implications of marginal costing?
- If MC lower than selling price, businesses can continue production to maximize profits.
- If MC close to or above the selling price, profit margins fall, signaling that the business may be in financial trouble.
– Competitive strength
- Businesses have MC is lower than the opponent maybe sale price while still maintaining profits, creating competitive advantages in the market.
- Conversely, if MC is higher, the firm may experience price pressure and lose market share.
– Ability to expand business based on marginal cost per volume
- If MC slow increase in output, businesses are able to scale without incurring too much cost.
- If MC increase rapidly, expansion may be unsustainable or require technology investments to reduce costs.
– Financial risk
- If MC is consistently higher than selling price → The business may be selling at a loss, and needs to re-evaluate pricing strategy and optimize costs.
- If MC fluctuates strongly → Raw material or labor costs may be unstable, affecting long-term financial planning.
In short, it is possible to evaluate a business based on MC, but it needs to be combined with other indicators such as:
- Gross profit & net profit → See if the business is making a profit.
- Profit Margin → Assess profitability.
- Fixed costs & variable costs → Understand the cost structure.
- Brand strength & market share → MC is low but without a strong brand, it is still difficult for a business to succeed.
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Conclude
The following article answers the question What is marginal cost? along with suggestions regarding cost management efficiency. Marginal costing is an important concept in business and finance, helping businesses make effective production, pricing and cost management decisions. Understanding the concept, formula and meaning of What is marginal cost? will help build a suitable business or investment plan.
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