One of the interesting topics of environmental economics is economic valuation. What is economic valuation and how does it work? What is change in income technique as an example of the tools of economic valuation?
This article explains these concepts including a backgrounder on environmental economics—a field of environmental science to facilitate understanding.
Table of Contents
The Meaning of Economic Valuation
To put things into context, let us first define the meaning of economic valuation as a major subject in environmental science.
Economic valuation entails imputing monetary value to environmental and natural resources that were once regarded free. This is because everyone thought that natural and environmental resources are inexhaustible.
But we know it’s not the case because if we lose something that compromises the fulfillment of our needs, value is lost. It is a scarce resource that can be managed by putting monetary value to it.
Hence, we can define economic valuation as the process of measuring the value of goods, services, or policies, often in monetary terms, based on how much people are willing to pay for them or sacrifice to obtain them.
Economic valuation is the process of measuring the value of goods, services, or policies, often in monetary terms, based on how much people are willing to pay for them or sacrifice to obtain them.
Economic value is the value that a person places on a good or service, based on the benefit they get from it. This is different from market value because it’s subjective.
Consumer preferences and resource scarcity determine the economic value of a good or service. Producers look at economic value, such as willingness to pay and hedonic pricing, when setting prices.
Background on the Rise of Environmental Economics
It was not until around the 1960s, during the height of the industrial revolution, when people realized that natural resources like clean air has value attached to it. Although air may be inexhaustible, its quality can be compromised. Polluted air is associated with various diseases of the respiratory system thus entail cost.
Air is consumed by everyone, and anything that is being consumed is a good. A good can be represented by money. But the amount of money that corresponds to, say, a liter of fresh air, is not easily determined.
Unlike other goods found in the market, air is neither sold nor bought. But we know for sure that clean air is a valuable resource that, just like any resource that we consume, provides benefit to everyone. Clean air is one important good that man could not do without.
The air people consume (by inhaling it in their lungs and deriving oxygen to burn food hence release energy), just like any good, exists at various levels of quality. Air of good quality provides greater benefit to people than air of poor quality. Air of poor quality or polluted air can cause different kinds of illnesses. Thus, a good of excellent quality provides greater benefit to consumers than a good that is of inferior quality.
Why is it necessary to assign monetary value to clean air? The main purpose of assigning value is to be able to manage this important natural resource. Unless monetary value is given to it, people tend to undermine its importance as anyone could get it free.
At best, the value of a consumed good like clean air can only be estimated. This can be done through indirect means.
In environmental economics, one of the tools used in valuing natural resources such as air is the change in income technique. How is this economic valuation tool used?
Change in income technique is discussed in greater detail in the next section using air as an example to demonstrate how this valuation technique works.
What is Change in Income Technique? An Example of Economic Valuation to Measure Air Quality
In today’s civilized cities, it is expected that some degree of air pollution exists. The value of the ambient air, therefore, lies within a range of air quality, i. e., clean air to highly polluted air. Correspondingly, clean air will be valued more by people than polluted air; but how much will that be?
Since the value of clean air could not be directly measured, this can be valued indirectly by looking into the change in people’s income due to loss of work from ill health, premature illness or death resulting from polluted air. If the quality of air is improved, there will be improvement in health, illnesses are reduced or avoided, and premature death is prevented.
Therefore, the value of air improvement is equal to the difference in income between people living in a polluted air environment and in another location or state of better air quality. It is assumed that more income will be gained by people due to better health achieved in a locality with cleaner air. Cleaner air environment is associated with healthier people who are able to do more work, thus more income gained.
Conversely, if people have more income, they are able to avoid illness and thus have a better quality of life. The outcome is positive for good air quality: more productivity thus much better income. Good air quality can ultimately power economies towards a better quality of life for the general population.
Use of the Valuation Technique: Comparing Costs and Benefits
How can the quality of air be improved so that people will gain more income?
This can be done by formulating and implementing pollution control regulations to limit, reduce or eliminate the source of pollution. But the implementation of pollution control regulations entail cost in terms of the personnel required to implement it, equipment to monitor emissions, advocacy through information and education campaign, among others.
If the government is keen in improving pollution control regulations and enabling effective enforcement by investing money to carry this out, then positive benefits can accrue. In this light, the financial capacity and willingness of governments coupled to reach the goal of cleaning the air through various means is a major consideration.
Now, once income increases after implementation of pollution control regulations, then it is now possible to compare the costs and the gains. A cost-benefit analysis can then be made to determine the effectiveness of such campaign. If benefit (B) in terms of increased income far outweigh the cost (C) of implementing pollution control regulations, then the cost of implementing pollution control regulations is justified.
These scenarios can be represented by the generalized equations of cost and benefit below.
- B-C=0: Pollution control regulation has no effect at all
- B-C>0: Pollution control regulation is effective
- B-C<0: Pollution regulation is not worth it.
where B is the total benefit, and C is the total cost.
It will be desirable to attain condition 2 but the outcome may depend on a given time frame of assessment. It is possible that either condition 1 and 3 may be that outcome during the early stage of implementation of pollution control regulation.
Change in income therefore is a useful economic valuation tool that can be used to measure the relative value of air quality. Its application is straightforward, although a strong link must be established between air quality and health and vice-versa.
Conclusion
Economic valuation, particularly through tools like the change in income technique, provides a practical framework for understanding and managing environmental resources that lack traditional market prices. By quantifying the monetary value of clean air through measurable indicators such as productivity, health outcomes, and income changes, policymakers can make informed decisions about environmental regulations and their implementation. While the change in income technique offers a straightforward approach to valuing air quality improvements, its effectiveness depends on establishing clear connections between environmental conditions and economic outcomes.
Ultimately, economic valuation serves as a bridge between environmental science and policy action, transforming abstract environmental benefits into concrete economic terms that can guide resource management decisions. As societies continue to grapple with environmental challenges, these valuation techniques will remain essential tools for balancing economic development with environmental sustainability, ensuring that natural resources like clean air are properly valued, protected, and managed for current and future generations.
Frequently Asked Questions
What is change in income technique?
The change in income technique is an indirect economic valuation method used to measure the monetary value of environmental quality (such as clean air). It estimates this value by analyzing changes in people’s productivity and income resulting from health improvements or avoided illnesses due to better environmental conditions.
What is a change in income technique example?
A primary change in income technique example is evaluating air quality. In a polluted environment, workers may suffer from respiratory illnesses, leading to missed workdays and lost wages. By implementing air pollution regulations and improving air quality, workers experience better health, leading to increased productivity and higher income. The difference in income between individuals in a polluted area versus a cleaner locality represents the monetary value of the improved air quality.
What are economic valuation techniques?
Economic valuation techniques are tools used in environmental economics to assign monetary values to natural resources and environmental services that lack traditional market prices. Since resources like clean air are not directly bought or sold, these techniques—including the change in income technique, hedonic pricing, and willingness-to-pay assessments—help estimate their value indirectly to guide resource management and policy decisions.
How does the economic valuation of ecosystem services support policy decisions?
The economic valuation of ecosystem services translates environmental benefits (like air filtration or resource availability) into concrete financial terms. This allows policymakers to conduct cost-benefit analyses comparing the costs of enforcing environmental regulations against the economic gains from improved public health and productivity. If total benefits (B) exceed total costs (C), the regulatory investment is economically justified (B – C > 0).
Why are environmental valuation methods important in environmental science?
Environmental valuation methods are essential because natural resources were historically treated as inexhaustible free goods. By imputing monetary value to scarce resources, these methods bridge environmental science and public policy, ensuring that the economic impact of pollution and resource degradation is recognized, managed, and balanced with sustainable development.
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