Last updated: August 2, 2026
The law of increasing opportunity cost states that as production of one good increases, the marginal opportunity cost of producing additional output also rises. In practical terms, equal increases in one product eventually require giving up progressively larger amounts of another product.
This happens because workers, equipment, land, and other resources are not equally suited to every task. A factory may transfer its most adaptable resources first, but further expansion eventually requires moving resources that are more productive in their original roles.
For example, producing an additional 10 laptops might initially cost four bicycles, while a later increase of 10 laptops might cost 14 bicycles. Economists illustrate this changing tradeoff with a bowed production possibilities frontier, or PPF. Federal Reserve Education and OpenStax both connect the outward-bending PPF with rising marginal opportunity cost and differences in resource suitability.
What Is the Law of Increasing Opportunity Cost?
The law of increasing opportunity cost means that the amount sacrificed for each additional increase in production becomes larger.
Opportunity cost itself is the value of the next-best alternative forgone when a choice is made. It can involve money, time, output, labor, equipment, or another benefit—not only a cash expense.
The word marginal is important. The law does not merely say that producing something requires a tradeoff. It says the tradeoff grows as production continues expanding.
Why Opportunity Cost Increases
Resources are specialized rather than equally productive in every possible use.
Consider a factory that produces bicycles and laptops. Some employees may already have electronics experience and can move into laptop production with little loss of bicycle output. Other workers may be highly specialized bicycle technicians who are far less productive when reassigned.
The likely sequence is:
- Resources best suited to the new product move first.
- Moderately suitable resources move next.
- Highly specialized resources are transferred only after the easier options have been used.
- Each later transfer causes a larger reduction in the original product.
Federal Reserve Education uses this resource-suitability logic to explain why opportunity cost increases as production moves along a curved PPF.
Opportunity Cost vs. Increasing Opportunity Cost
| Opportunity cost | Increasing opportunity cost |
| The value of the next-best alternative forgone | A pattern in which the amount forgone rises across successive production increases |
| Can describe a single decision | Requires comparison across multiple changes |
| Does not have to rise | Specifically describes rising marginal sacrifice |
| Example: attending college instead of working | Example: each additional semester displaces increasingly valuable work or career opportunities |
Every case of increasing opportunity cost involves an opportunity cost. However, one tradeoff by itself does not prove that opportunity cost is increasing.
To identify an increasing pattern, compare at least two successive production changes.
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Increasing Opportunity Cost Example With Numbers
Suppose a factory can produce laptops, bicycles, or a combination of both.
The figures below are illustrative and are designed to demonstrate the calculation. They do not represent actual factory output.
| Production combination | Laptops | Bicycles | Additional laptops | Bicycles forgone |
| A | 0 | 100 | — | — |
| B | 10 | 96 | 10 | 4 |
| C | 20 | 88 | 10 | 8 |
| D | 30 | 74 | 10 | 14 |
| E | 40 | 52 | 10 | 22 |
At combination A, all available resources are used to produce bicycles.
Moving from A to B produces 10 laptops and reduces bicycle production from 100 to 96. The opportunity cost of those 10 laptops is four bicycles.
Moving from B to C produces another 10 laptops, but the factory now gives up eight bicycles. Later increases require even larger sacrifices.
| Movement | Laptop gain | Bicycles forgone | Opportunity cost per laptop |
| A to B | 10 | 4 | 0.4 bicycles |
| B to C | 10 | 8 | 0.8 bicycles |
| C to D | 10 | 14 | 1.4 bicycles |
| D to E | 10 | 22 | 2.2 bicycles |
The cost per laptop rises from 0.4 bicycles to 0.8, 1.4, and 2.2 bicycles. That rising marginal sacrifice demonstrates the law of increasing opportunity cost.
What Proves That the Cost Is Increasing?
Three details matter:
- Laptop production rises by an equal amount at every step.
- The number of bicycles sacrificed becomes larger.
- The sacrifice per additional laptop rises across successive movements.
A statement such as “the factory makes more laptops and fewer bicycles” shows a tradeoff. It does not prove increasing opportunity cost unless the marginal sacrifice is compared across multiple changes.
How to Calculate Increasing Opportunity Cost
The production-based formula is:
Opportunity cost of additional X = units of Y forgone ÷ additional units of X produced
Follow four steps.
1. Identify Which Output Is Increasing
Suppose laptop production rises from 20 to 30 units.
Laptops are the chosen output.
2. Calculate the Increase in the Chosen Output
30 laptops − 20 laptops = 10 additional laptops
3. Calculate the Amount Forgone
Bicycle production falls from 88 to 74.
88 bicycles − 74 bicycles = 14 bicycles forgone
4. Divide the Amount Forgone by the Amount Gained
14 bicycles ÷ 10 laptops = 1.4 bicycles per laptop
Always include the units. An answer of “1.4” alone does not explain what was gained or sacrificed.
Reversing the Calculation
The direction of the question determines which output belongs in the numerator.
To calculate the opportunity cost of laptops:
Bicycles forgone ÷ laptops gained
To calculate the opportunity cost of bicycles over the same movement:
Laptops forgone ÷ bicycles gained
These two ratios are reciprocals when they describe the same movement between two production combinations. On a curved PPF, however, the ratio changes when production moves to a different section of the curve.
Production Tradeoffs vs. Financial Comparisons
Opportunity cost is measured differently depending on what is being compared.
| Situation | Useful calculation |
| Moving between production combinations | Units of one output forgone ÷ units of the other output gained |
| Comparing two expected financial returns | Expected return of the next-best option minus the expected return of the chosen option |
| Comparing uses of time | Value of the best alternative use of that time |
In an investment comparison, subtraction shows the expected return gap between two choices. It is not a universal opportunity-cost formula, and neither expected return is guaranteed.
The underlying principle remains the same: choosing one option means giving up the next-best available alternative.
How the Production Possibilities Frontier Shows Increasing Opportunity Cost
A production possibilities frontier shows the combinations of two goods or services that can be produced with available resources and technology.
A point on the frontier represents a production combination where producing more of one good requires reducing production of the other. Choices inside the frontier indicate unused or inefficiently used resources, while choices outside it are currently unattainable.
Why the PPF Bows Outward
A PPF showing increasing opportunity cost bends outward because the resources used in production have different capabilities.
Near one end of the curve, an organization can expand a product by transferring resources that are reasonably well suited to it. The loss of the other product is relatively small.
Farther along the curve, the easiest transfers have already been made. Additional expansion requires moving less-suitable resources, causing a larger loss of the other product.
OpenStax explains that this rising marginal tradeoff produces the outward-bending shape of the PPF.
In the laptop-and-bicycle example, the first additional 10 laptops cost four bicycles. A later increase of 10 laptops costs 22 bicycles. Those growing sacrifices make the curve progressively steeper as laptop production increases.
The Slope Measures Marginal Opportunity Cost
The slope of a PPF shows how much of the good on the vertical axis must be given up to obtain more of the good on the horizontal axis.
It can be calculated as:
Change in the vertical-axis output ÷ change in the horizontal-axis output
Suppose:
- Laptop production rises by 10.
- Bicycle production falls by 14.
The mathematical slope is:
−14 ÷ 10 = −1.4
The negative sign reflects that one output falls as the other rises. When discussing opportunity cost, the absolute value is normally used:
Opportunity cost = 1.4 bicycles per laptop
The slope of the PPF therefore represents the production tradeoff between the two outputs.
Points Inside, On and Outside the PPF
- On the PPF: Production is productively efficient. More of one output cannot be produced without reducing the other.
- Inside the PPF: Some resources are unemployed or used inefficiently.
- Outside the PPF: The combination is not currently attainable with existing resources and technology.
Federal Reserve Education uses points inside the frontier to illustrate underemployment, while OpenStax describes points on the curve as productively efficient.
A point on the PPF is not automatically the best choice. Each point represents a different output mix, and the preferred combination depends on priorities and the value placed on each output.
Movement Along the PPF vs. a Shift of the PPF
A movement along the PPF represents a reallocation of existing productive resources. The organization produces more of one output and less of another.
An outward shift represents greater productive capacity, which could result from additional resources, improved technology, or higher productivity.
An inward shift represents reduced productive capacity.
Increasing opportunity cost is observed while moving along a bowed PPF. A shift changes the amount the economy or organization is capable of producing.
Increasing vs. Constant Opportunity Cost
| Feature | Increasing opportunity cost | Constant opportunity cost |
| Marginal sacrifice | Rises | Remains unchanged |
| Resource assumption | Resources differ in suitability | Resources transfer at a consistent rate |
| PPF shape | Bowed outward | Straight line |
| Slope | Changes along the curve | Remains constant |
| Example | Each 10 laptops costs more bicycles | Each 10 laptops always costs five bicycles |
Law of Constant Opportunity Cost
Constant opportunity cost means that each equal increase in one product requires giving up the same amount of another product.
Suppose:
- The first 10 laptops cost five bicycles.
- The next 10 laptops cost five bicycles.
- The following 10 laptops also cost five bicycles.
The opportunity cost remains:
5 bicycles ÷ 10 laptops = 0.5 bicycles per laptop
The PPF is a straight line because its slope does not change. Federal Reserve Education contrasts this straight-line case with the curved PPF associated with increasing opportunity cost.
What Does Decreasing Opportunity Cost Mean?
In this guide, decreasing opportunity cost describes the opposite numerical pattern: each equal increase in one output requires giving up progressively less of another output.
For example, the first 10 units might require sacrificing 15 units of another product, while the next 10 require sacrificing only eight.
This pattern receives much less attention in introductory economics than increasing or constant opportunity cost. The most reliable way to identify it is to examine the production schedule: when the marginal sacrifice falls as output expands, opportunity cost is decreasing.
Increasing Opportunity Cost vs. Diminishing Returns
Increasing opportunity cost and diminishing returns describe different economic relationships.
| Increasing opportunity cost | Diminishing returns |
| Compares two outputs or uses of resources | Examines output generated by additional inputs |
| Resources are transferred between activities | More of an input is devoted to production |
| Measures what must be forgone | Measures the additional output produced |
| Commonly illustrated with a PPF | Commonly illustrated with a production function |
The law of diminishing returns states that as additional increments of resources are devoted to producing something, the marginal increase in output eventually becomes smaller.
The concepts can be connected. When transferred resources become progressively less productive in their new use, more resources may be required to obtain the same additional output. That can increase the amount of the original product that must be sacrificed.
They are not identical, however. Diminishing returns concerns the additional output generated by inputs. Increasing opportunity cost concerns the growing sacrifice required to change the production mix.
Real-World Examples of Increasing Opportunity Cost
The following scenarios are illustrative. Whether opportunity cost actually rises depends on the value and productivity of the specific resources being transferred.
Business Production
Suppose a software company moves employees from customer support into sales.
The first employees transferred may already have sales experience, strong product knowledge, and spare capacity. Moving them may have little effect on customer service.
As the company continues expanding its sales team, it may need to transfer specialized support employees. Those workers may be less effective in sales while leaving larger gaps in customer support.
The first five transfers might cause only a small increase in response times. The next five could create a significant backlog. Further transfers might lead to unresolved cases or customer losses.
The opportunity cost rises because each additional expansion removes resources that are more valuable in their original role.
Agriculture
A farmer expanding wheat production may first use land that is naturally suitable for wheat and not especially valuable for other crops.
Further expansion may require converting land that produces another crop efficiently, requires more irrigation, or is less suitable for wheat.
Each additional acre of wheat can therefore require sacrificing increasingly valuable alternative production.
Planting wheat instead of corn demonstrates opportunity cost. It demonstrates increasing opportunity cost only when the amount of corn or another benefit forgone rises as more land is converted.
Government Resource Allocation
A government may redirect resources from one public program to another.
The easiest savings might come from unused capacity or delayed low-priority projects. Further reallocations could require cutting active services, reducing staff, or postponing necessary maintenance.
The opportunity cost rises when the least damaging reductions are made first and later reductions require increasingly valuable sacrifices.
Personal Time and Money Decisions
Imagine someone gradually increasing the hours devoted to a side hustle.
The first five weekly hours may replace low-value screen time. The next five may replace exercise or social time. Another five may reduce sleep, study time, family responsibilities, or performance at a primary job.
The example demonstrates increasing opportunity cost only if each additional block of work displaces something more valuable than the previous block.
Common Mistakes When Reading PPF Questions
| Mistake | Better approach |
| Calculating the total sacrifice | Calculate each movement separately |
| Reversing the formula | Put the forgone output in the numerator |
| Forgetting units | State the result as one good per unit of the other |
| Using one tradeoff as proof | Compare at least two successive changes |
| Assuming every PPF is curved | A straight PPF represents constant opportunity cost |
| Confusing movement with a shift | Movement changes the production mix; a shift changes productive capacity |
| Assuming every point on the PPF is ideal | Productive efficiency does not determine which output mix is preferred |
| Treating cash spending as the full cost | Identify the next-best alternative forgone |
| Calling every rising expense an opportunity cost | Accounting expenses and opportunity costs are not identical |
Quick Test: Does the Scenario Show Increasing Opportunity Cost?
Ask four questions:
- Does the chosen output or activity increase in multiple steps?
- Is another output, benefit, or use of resources being sacrificed?
- Does the sacrifice per additional unit become larger?
- Can the increase be explained by differences in resource suitability or increasingly valuable alternatives?
Classify the pattern by comparing the sacrifice across equal production increases:
- Rising sacrifice: Increasing opportunity cost.
- Unchanged sacrifice: Constant opportunity cost.
- Falling sacrifice: Decreasing opportunity cost.
- Only one tradeoff shown: Not enough information to identify a pattern.
Frequently Asked Questions
What Is an Example of Increasing Opportunity Cost?
Suppose producing the first 10 laptops requires giving up four bicycles, the next 10 require giving up eight bicycles, and the following 10 require giving up 14 bicycles. The opportunity cost increases because each equal expansion in laptop production causes a larger loss of bicycle output.
What Are the Two Types of Opportunity Cost?
A common classroom distinction separates explicit costs and implicit costs.
Explicit costs are direct monetary payments, such as wages, rent, or materials. Implicit costs are noncash benefits that are forgone, such as the salary a business owner gives up by leaving another job.
Opportunity cost is the value of the next-best alternative forgone. Implicit costs are clear opportunity costs, while an explicit payment also has an opportunity cost because the money can no longer be used for its next-best alternative.
This distinction differs from increasing and constant opportunity cost, which describe how the sacrifice changes as production expands.
What Is a Real-Life Example of Opportunity Cost?
A student who attends college instead of working full time may give up current wages in exchange for education. Those forgone wages are part of the opportunity cost.
This example shows ordinary opportunity cost. It would demonstrate increasing opportunity cost only if each additional period of education required giving up progressively more valuable income, experience, or another opportunity.
Does Every PPF Show Increasing Opportunity Cost?
No. A straight-line PPF shows constant opportunity cost because the same amount of one good is sacrificed for each equal increase in the other. A bowed-out PPF shows increasing opportunity cost because the marginal tradeoff changes along the curve.
Why Does a PPF Bow Outward?
A PPF bows outward because resources are not equally suitable for every type of production. Resources best suited to the expanding product move first. Later increases require transferring less-suitable resources, so progressively more of the other product must be given up.
What to Remember About Increasing Opportunity Cost
- Opportunity cost is the value of the next-best alternative forgone.
- Increasing opportunity cost means the marginal sacrifice rises as production expands.
- The pattern occurs because resources differ in their productive uses.
- A bowed-out PPF illustrates the changing tradeoff.
- PPF opportunity cost is calculated as units forgone divided by units gained.
- A single choice demonstrates opportunity cost, but not necessarily increasing opportunity cost.
The fastest way to recognize the law is to compare several production changes. When equal increases in one output require progressively larger reductions in another, opportunity cost is increasing.
Editorial Methodology
This guide uses introductory economics material from Federal Reserve Education, the Federal Reserve Bank of St. Louis, and OpenStax. The laptop-and-bicycle figures and real-world scenarios are illustrative examples created to explain the calculation and should not be interpreted as actual production data.
Sources:
- Federal Reserve guide to increasing opportunity cost and the production possibilities frontier
- OpenStax explanation of the production possibilities frontier and opportunity cost
- Federal Reserve lesson on the PPF, underemployment, and economic growth
- Federal Reserve Bank of St. Louis guide to opportunity cost in real-life decisions
- Federal Reserve explanation of explicit and implicit production costs
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